Tabella di riferimento delle funzioni PHP

Fav

Remove spaces or characters

function (math.)	full solution (a math problem)
trim	Remove spaces or other predefined characters from both ends of a string
rtrim	Remove spaces or other predefined characters from the right side of the string
chop	Alias for rtrim()chop() differs from Perl's chop() function in that it removes the last character of the string.
ltrim	Remove spaces or other predefined characters from the left side of the string

String generation and conversion

function (math.)	full solution (a math problem)
str_pad	Fill the string with another string of the specified length
str_split	Converting strings to arrays
strrev	invert the string (computing)
wordwrap	Break a string to a specified number of words
str_shuffle	Randomly scramble a string
parse_str	Parsing strings into variables
number_format	Formatting Strings by Thousand Bit Grouping

String Case Conversion

function (math.)	full solution (a math problem)
strtolower	Convert strings to lowercase
strtoupper/td>	Convert strings to uppercase
ucfirst	Convert the first letter of a string to uppercase
lcfirst	Convert the first letter of a string to lowercase
ucwords	Convert the first letter of each word in a string to uppercase

html tag association

function (math.)	full solution (a math problem)
htmlentities	Convert characters to HTML entities
htmlspecialchars	Predefined strings to HTML encoding
nl2br	Insert HTML line break tags before all new lines in the string \n转换为<br>标签
strip_tags	Remove HTML and PHP tags from strings
addcslashes	Using backslashes to escape characters in a string in C style
stripcslashes	Dereferencing a string escaped using addcslashes()
addslashes	Quoting strings with backslashes
stripslashes	Remove escaped characters added by addslashes
quotemeta	Backslashes before certain predefined strings in strings
chr	Returns a character from a specified ASCII value
ord	Returns the ASCII value of the first character of the string

string comparison

function (math.)	full solution (a math problem)
strcasecmp	Compare two strings case-insensitively
strcmp	Compare two strings case-sensitively
strncmp	Compare the first N characters of a string, case sensitive.
strncasecmp	Compare the first N characters of a string, case insensitive.
strnatcmp	Natural order method for comparing string lengths, case sensitive
strnatcasecmp	Natural order method for comparing string lengths, not case-sensitive

String Find Replace

function (math.)	full solution (a math problem)
str_replace	String substitution operations, case-sensitive
str_ireplace	String substitution operations, case insensitive
substr_count	Counts the number of times a string, appears in another string
substr_replace	Replace a string with another string.
similar_text	Returns the number of identical characters in both strings
strrchr	Returns a string from the last occurrence of a string in another string to the end of the string.
strstr	Returns a string from the beginning to the end of a string in another string.
strchr	alias of strstr, returns a string from the first occurrence of one string in another to the end.
stristr	Returns a string from the beginning to the end of another string, case-insensitive.
strtr	Convert certain characters in a string
strpos	Finding the first position in a character where certain characters appear first
stripos	Finds the first occurrence of certain characters in a character, not case sensitive
strrpos	Finding the last occurrence of certain characters in a character
strripos	Finds the last occurrence of certain characters in a character, not case sensitive
strspn	Returns the length of the first time a string matches the mask.
strcspn	Returns the length of the string that does not match the mask.

string stats

function (math.)	full solution (a math problem)
str_word_count	Counting the number of words in a string
strlen	Counting string length
count_chars	Counts the number of times all letters appear in a string (0..255)

string encoding

function (math.)	full solution (a math problem)
md5	Calculates the MD5 hash of a string
hash	Generate a hash code

Creating Arrays

function (math.)	full solution (a math problem)
array	Generate an array
array_combine	Generate an array with one array value as the key name and the other array value as the value
range	Creates and returns an array containing the specified range of elements
compact	Creates an array of the variables carried by the parameter
array_fill	Fill the generated array with the given values

Array merging and splitting

function (math.)	full solution (a math problem)
array_chunk	Splitting an Array into New Array Blocks
array_merge	Combine two or more arrays into a single array
array_slice	Takes a segment of values in an array based on a condition and returns it.

Comparison of arrays

function (math.)	full solution (a math problem)
array_diff	Returns an array of the difference between two arrays
array_intersect	Returns an array of the intersection of two or more arrays.

Array Find Replace

function (math.)	full solution (a math problem)
array_search	Finding a key value in an array
array_splice	Remove part of the array and replace it with other values
array_sum	Returns the sum of all values in the array
in_array	Searches for a specified value in an array, case sensitive.
array_key_exists	Determines whether the specified key exists in an array.

array pointer operation

function (math.)	full solution (a math problem)
key	Returns the name of the key that the pointer inside the array is currently pointing to.
current	Returns the current element of the array
next	Moves the pointer to the current element to the next element position and returns the value of the current element
prev	Moves the pointer to the current element to the previous element position and returns the value of the current element
end	Points an internal pointer to the last element of the array and returns the value of that element (if successful)
reset	Points an internal pointer to the first element of the array and returns the value of that element
list	Assigning values to a set of variables using elements of an array
array_shift	Deletes the first element of the array and returns the value of the deleted element
array_unshift	Inserts one or more elements at the beginning of the array
array_push	Presses one or more elements into the end of the array.
array_pop	Delete the last element of the array

array key-value operation

function (math.)	full solution (a math problem)
shuffle	Break up the array and keep the key names
count	Counts the number of cells in an array or the number of object attributes.
array_flip	Returns an array of flipped keys and values.
array_keys	Returns all the keys of an array as a single array.
array_values	Returns all the values of the array as an array
array_reverse	Returns an array with the elements in reverse order
array_count_values	Counts the number of times all values in an array appear
array_rand	Randomly select one or more elements from the array, note the key names
each	Returns the current key/value pair in the array and moves the array pointer one step forward.
array_unique	Remove duplicate values from an array

Array Sorting

function (math.)	full solution (a math problem)
sort	Sorting an array
rsort	Reverse sorting of arrays
asort	Sorting arrays and maintaining index relationships
arsort	Reverse sorting of arrays and maintaining index relationships
ksort	Sort the array by key name
krsort	Sorting an array in reverse order by key name
natsort	Sorting arrays using the "natural sort" algorithm
natcasesort	Sorting arrays using the "natural sort" algorithm without distinguishing upper and lower case letters

Math related

function (math.)	full solution (a math problem)
abs	Find the absolute value
ceil	rounding up to the nearest integer
floor	rounding
fmod	Returns the floating-point remainder of a division
pow	Returns the Nth power of a number
round	rounding of floating-point numbers
sqrt	square root
max	maximize
min	find the minimum value
mt_rand	Better Random Numbers
rand	random number
pi	Obtaining Pi
octdec	Octal to decimal conversion

MySql Related Functions

function (math.)	full solution (a math problem)
mysql_affected_rows	Get the number of rows affected by the previous MySQL operation.
mysql_client_encoding	Returns the name of the character set
mysql_close	Closing a MySQL Connection
mysql_connect	Open a connection to the MySQL server
mysql_create_db	Create a new MySQL database
mysql_data_seek	Moving pointers to internal results
mysql_db_name	Obtaining results data
mysql_db_query	Send a MySQL query
mysql_drop_db	Discarding (Deleting) a MySQL Database
mysql_errno	Returns the numeric code of the error message from the last MySQL operation.
mysql_error	Returns the text error message generated by the last MySQL operation.
mysql_escape_string	Escaping a string for use in mysql_query
mysql_fetch_array	Get a row from the result set as an associative array, or a numeric array, or both.
mysql_fetch_assoc	Get a row from the result set as an associative array
mysql_fetch_field	Get the column information from the result set and return it as an object
mysql_fetch_lengths	Get the length of each output in the result set
mysql_fetch_object	Obtain a row from the result set as an object
mysql_fetch_row	Get a row from the result set as an enumeration array
mysql_field_flags	Get the flag associated with the specified field from the result
mysql_field_len	Returns the length of the specified field
mysql_field_name	Get the field name of the specified field in the result
mysql_field_seek	Set the pointer in the result set to the developed field offset
mysql_field_table	Get the name of the table where the specified field is located
mysql_field_type	Get the type of the specified field in the result set
mysql_free_result	Freeing the resultant memory
mysql_get_client_info	Getting MySQL Client Information
mysql_get_host_info	Getting MySQL Host Information
mysql_get_proto_info	Getting MySQL Protocol Information
mysql_get_server_info	Getting MySQL Server Information
mysql_info	Get information about the most recent query
mysql_insert_id	Get the ID generated by the previous INSERT operation.
mysql_list_dbs	List All Databases in MySQL Server
mysql_list_fields	Listing Fields in MySQL Results
mysql_list_processes	List MySQL processes
mysql_list_tables	Listing Tables in a MySQL Database
mysql_num_fields	Get the number of fields in the result set
mysql_num_rows	Get the number of rows in the result set
mysql_pconnect	Open a Persistent Connection to the MySQL Server
mysql_ping	Ping a server connection and reconnect if there is no connection
mysql_query	Send a MySQL query
mysql_real_escape_string	Escape special characters in strings used in SQL statements, taking into account the current character set of the connection
mysql_result	Obtaining results data
mysql_select_db	Selecting a MySQL Database
mysql_set_charset	Sets the client character set
mysql_stat	Get current system status
mysql_tablename	Get table name
mysql_thread_id	Returns the ID of the current thread
mysql_unbuffered_query	Sends a SQL query to MySQL and does not fetch and cache the resulting rows

File Catalog Related

function (math.)	full solution (a math problem)
basename	Returns the filename portion of the path
chgrp	Changing the group to which a file belongs
chmod	Change of document mode
chown	Changing the owner of a file
clearstatcache	Clearing the file state cache
copy	copy file
delete	See also unlink or unset
dirname	Returns the directory portion of the path
disk_free_space	Returns the free space in the directory
disk_total_space	Returns the total disk size of a directory
diskfreespace	Alias for disk_free_space
fclose	Close an open file pointer
feof	Tests if the file pointer has reached the end of the file position
fflush	Output buffer contents to file
fgetc	Read characters from a file pointer
fgetcsv	Reads a line from the file pointer and parses the CSV field
fgets	Read a line from a file pointer
fgetss	Reads a line from the file pointer and filters out the HTML tags.
file_exists	Checking for the existence of a file or directory
file_get_contents	Reads the entire file into a string
file_put_contents	Write a string to a file
file	Read the entire file into an array
fileatime	Obtain the last access time of the document
filectime	Get the inode modification time of a file
filegroup	Groups to obtain documents
fileinode	Get the inode of the file
filemtime	Obtain document modification time
fileowner	Get the owner of the file
fileperms	Obtaining file permissions
filesize	Get the file size
filetype	Get document type
flock	Lightweight consulting document locking
fnmatch	Matching filenames with patterns
fopen	Open a file or URL
fpassthru	Outputs all remaining data at the file pointer
fputcsv	Format rows to CSV and write to file pointer
fputs	Alias for fwrite
fread	Reading files (safe to use for binary files)
fscanf	Formatting input from a file
fseek	Locate in the file pointer
fstat	Getting file information from an open file pointer
ftell	Returns the file pointer read/write position
ftruncate	Truncate a file to a given length
fwrite	Write to file (safe for binary files)
glob	Find the file path that matches the pattern
is_dir	Determines whether a given filename is a directory
is_executable	Determines whether a given filename is executable
is_file	Determine if the given filename is a normal file
is_link	Determines whether a given filename is a symbolic link.
is_readable	Determines whether a given filename is readable
is_uploaded_file	Determines if a file was uploaded via HTTP POST.
is_writable	Determines whether a given filename is writable
is_writeable	Alias for is_writable
lchgrp	Changes group ownership of symlink
lchown	Changes user ownership of symlink
link	Create a hard connection
linkinfo	Getting information about a connection
lstat	Give information about a file or symbolic link
md5_file	Compute the MD5 hash of the file
mkdir	New Catalog
move_uploaded_file	Moving uploaded files to a new location
parse_ini_file	Parsing a configuration file
parse_ini_string	Parse a configuration string
pathinfo	Returns information about the path to the file
pclose	Close process file pointer
popen	Open process file pointer
readfile	Exporting a file
readlink	Returns the target pointed to by the symbolic link
realpath_cache_get	Get realpath cache entries
realpath_cache_size	Get realpath cache size
realpath	Returns normalized absolute path names
rename	Rename a file or directory
rewind	Reverse the position of the file pointer
rmdir	Delete Catalog
set_file_buffer	Alias for stream_set_write_buffer
stat	Give information about the file
symlink	Creating symbolic connections
tempnam	Create a file with a unique file name
tmpfile	Create a temporary file
touch	Setting access and modification times for documents
umask	Change the current umask
unlink	Delete file

GD/Image Functions

function (math.)	full solution (a math problem)
gd_info	Get information about the currently installed GD libraries
getimagesize	Get image size
getimagesizefromstring	Get the size of an image from a string
image_type_to_extension	Get the file suffix of the image type
image_type_to_mime_type	取得 getimagesize，exif_read_data，exif_thumbnail，exif_imagetype 所返回的图像类型的 MIME 类型
image2wbmp	Export images to a browser or file in WBMP format
imagealphablending	Setting the color mixing mode of an image
imageantialias	Whether or not to use antialias function
imagearc	draw an elliptical arc
imagechar	Draw a character horizontally
imagecharup	Draw a character vertically
imagecolorallocate	Assigning colors to an image
imagecolorallocatealpha	Assign color + alpha to an image
imagecolorat	Get the color index value of a pixel
imagecolorclosest	Get the index value of the color closest to the specified color.
imagecolorclosestalpha	Get the color closest to the specified color plus transparency.
imagecolorclosesthwb	Get the index of the black and white of the chroma closest to the given color
imagecolordeallocate	Unassigning image colors
imagecolorexact	Get the index value of the specified color
imagecolorexactalpha	Get the index value of the specified color plus transparency
imagecolormatch	Match the palette version of an image more closely to the true-color version.
imagecolorresolve	Obtains the index value of the specified color or the closest possible alternative value.
imagecolorresolvealpha	Get the index value of the specified color + alpha or the closest possible alternative.
imagecolorset	Sets the color for the specified palette index
imagecolorsforindex	Get the color of an index
imagecolorstotal	Get the number of colors in an image's palette.
imagecolortransparent	Define a color as transparent
imageconvolution	Apply a 3x3 convolution matrix with coefficients div and offset.
imagecopy	Copying part of an image
imagecopymerge	Copy and merge parts of an image
imagecopymergegray	Copy and merge parts of an image in grayscale
imagecopyresampled	Resampling copies part of the image and resizing it
imagecopyresized	Copy part of the image and resize it
imagecreate	Create a new palette-based image
imagecreatefromgd2	Creating a new image from a GD2 file or URL
imagecreatefromgd2part	Create a new image from a given GD2 file or part of a URL.
imagecreatefromgd	Creating a new image from a GD file or URL
imagecreatefromgif	Creating a new image from a file or URL
imagecreatefromjpeg	Creating a new image from a file or URL
imagecreatefrompng	Creating a new image from a file or URL
imagecreatefromstring	Create a new image from the image stream in the string
imagecreatefromwbmp	Creating a new image from a file or URL
imagecreatefromxbm	Creating a new image from a file or URL
imagecreatefromxpm	Creating a new image from a file or URL
imagecreatetruecolor	Create a new true color image
imagedashedline	Draw a dotted line
imagedestroy	Destruction of an image
imageellipse	Draw an ellipse
imagefill	area fill
imagefilledarc	Draw an elliptical arc and fill it
imagefilledellipse	Draw an ellipse and fill it
imagefilledpolygon	Draw a polygon and fill it
imagefilledrectangle	Draw a rectangle and fill it
imagefilltoborder	The area is filled until the border of the specified color
imagefilter	Applying filters to images
imagefontheight	Get the height of the font
imagefontwidth	Get the width of the font
imageftbbox	Gives a text box using the FreeType 2 font
imagefttext	Writing text to images using FreeType 2 fonts
imagegammacorrect	Apply gamma correction to GD images
imagegd2	Export GD2 images to a browser or file
imagegd	Export GD images to a browser or file
imagegif	Export images to a browser or file
imagegrabscreen	Captures the whole screen
imagegrabwindow	Captures a window
imageinterlace	Enable or disable interlacing
imageistruecolor	Check if the image is a true color image
imagejpeg	Export images to a browser or file
imagelayereffect	Setting the alpha color mixing flag to use the bound libgd layering effect
imageline	Draw a line segment
imageloadfont	Load a new font
imagepalettecopy	Copying color palettes from one image to another
imagepng	Export images to a browser or file in PNG format
imagepolygon	Draw a polygon
imagepsbbox	Gives a text box using PostScript Type1 fonts
imagepsencodefont	Change the character encoding vector in the font
imagepsextendfont	Expand or streamline fonts
imagepsfreefont	Freeing the memory occupied by a PostScript Type 1 font
imagepsloadfont	Load a PostScript Type 1 font from a file
imagepsslantfont	Tilt a font
imagepstext	Drawing text strings on images with PostScript Type1 fonts
imagerectangle	Draw a rectangle
imagerotate	Rotate the image with a given angle
imagesavealpha	Set the flag to preserve full alpha channel information when saving PNG images (as opposed to a single transparent color)
imagesetbrush	Setting the brush image for drawing lines
imagesetpixel	Drawing a single pixel
imagesetstyle	Setting the style of line drawing
imagesetthickness	Setting the width of the line
imagesettile	Setting the texture used for filling
imagestring	Horizontally draw a line of string
imagestringup	Draw a line of string vertically
imagesx	Get the width of the image
imagesy	Get image height
imagetruecolortopalette	Converting True Color Images to Palette Images
imagettfbbox	Get the range of text that uses TrueType fonts
imagettftext	Writing text to an image with TrueType fonts
imagetypes	Returns the image types supported by the current PHP version
imagewbmp	Export images to a browser or file in WBMP format
imagexbm	Export XBM images to a browser or file
iptcembed	Embedding binary IPTC data into a JPEG image
iptcparse	Parses binary IPTC http://www.iptc.org/ blocks into individual tokens
jpeg2wbmp	Convert JPEG image files to WBMP image files
png2wbmp	Convert PNG image files to WBMP image files

session function

function (math.)	full solution (a math problem)
session_cache_expire	Returns the current cache expiration
session_cache_limiter	get and set the current cache limit/gold
session_commit	Alias for session_write_close
session_decode	Streams session data from a session-encoded string
session_destroy	Destroy all data registered to the session
session_encode	Encodes the current session data into a string.
session_get_cookie_params	Get session cookie parameters
session_id	Get and/or set the current session identifier
session_is_registered	Check if the variable is registered in the session
session_module_name	Get and/or set the current session module
session_name	Get and/or set the current session name
session_regenerate_id	Update the newly generated session identifier
session_register_shutdown	session shutdown feature
session_register	Registering one or more global variables with the current session
session_save_path	Get and/or set the current session save path
session_set_cookie_params	Setting session cookie parameters
session_set_save_handler	Setting up user-level session storage
session_start	Starting a new or resuming an existing session
session_status	Returns the current session status
session_unregister	Logout a global variable of the current session.
session_unset	Free all session variables
session_write_close	Write session data and end session

cookie function

function (math.)	full solution (a math problem)
setcookie()	Setting cookies
setrawcookie	Sending cookies without URL encoding

Time-Date Functions

function (math.)	full solution (a math problem)
checkdate	Validating a Gregorian date
date_add	Alias DateTime::add
date_create_from_format	Alias DateTime::createFromFormat
date_create	Alias DateTime::__construct
date_date_set	Alias DateTime::setDate
date_default_timezone_get	Get the default time zone used by all datetime functions in a script.
date_default_timezone_set	Sets the default time zone to be used for all datetime functions in a script.
date_diff	Alias DateTime::diff
date_format	Alias DateTime::format
date_get_last_errors	Alias DateTime::getLastErrors
date_interval_create_from_date_string	Alias DateInterval::createFromDateString
date_interval_format	Alias DateInterval::format
date_isodate_set	Alias DateTime::setISODate
date_modify	Alias DateTime::modify
date_offset_get	Alias DateTime::getOffset
date_parse_from_format	Get info about given date formatted according to the specified format
date_parse	Returns associative array with detailed info about given date
date_sub	Alias DateTime::sub
date_sun_info	Returns an array with information about sunset/sunrise and twilight begin/end
date_sunrise	Returns the sunrise time for the given date and location
date_sunset	Returns the sunset time for the given date and location
date_time_set	Alias DateTime::setTime
date_timestamp_get	Alias DateTime::getTimestamp
date_timestamp_set	Alias DateTime::setTimestamp
date_timezone_get	Alias DateTime::getTimezone
date_timezone_set	Alias DateTime::setTimezone
date	Formatting a local time/date
getdate	Obtaining date/time information
gettimeofday	Get the current time
gmdate	Formatting a GMT/UTC Date/Time
gmmktime	Get UNIX timestamps for GMT dates
gmstrftime	Format GMT/UTC time/date according to regional settings
idate	Format local time and date as an integer
localtime	obtain local time
microtime	Returns the current Unix timestamp and microseconds
mktime	Get the Unix timestamp of a date
strftime	Format local time/date according to regional settings
strptime	Parses the date/time generated by strftime.
strtotime	Parses the datetime description of any English text into a Unix timestamp
time	Returns the current Unix timestamp
timezone_abbreviations_list	Alias DateTimeZone::listAbbreviations
timezone_identifiers_list	Alias DateTimeZone::listIdentifiers
timezone_location_get	Alias DateTimeZone::getLocation
timezone_name_from_abbr	Returns the timezone name from abbreviation
timezone_name_get	Alias DateTimeZone::getName
timezone_offset_get	Alias DateTimeZone::getOffset
timezone_open	Alias DateTimeZone::__construct
timezone_transitions_get	Alias DateTimeZone::getTransitions
timezone_version_get	Gets the version of the timezonedb

Introduzione alla programmazione PHP:

1. PHP: un linguaggio di scripting lato server open source, particolarmente adatto allo sviluppo web e utilizzabile tramite incorporamento in codice HTML.

2. PHP è uno dei primi linguaggi di scripting lato server; da quando è stato creato da Rasmus Lerdorf nel 1995, è diventato uno dei linguaggi di programmazione più diffusi a livello globale.

3. PHP offre un'ampia gamma di funzioni integrate che coprono diversi aspetti, dall'elaborazione delle stringhe alle operazioni sul file system, dall'interazione con i database alla comunicazione di rete.

4. Padroneggiare le funzioni integrate di PHP consente di imparare rapidamente la programmazione in PHP e di risparmiare molto tempo e costi di sviluppo.