PHP常用

Variables

$_COOKIE - $HTTP_COOKIE_VARS [deprecated] — HTTP Cookies
$_ENV - $HTTP_ENV_VARS [deprecated] — Environment variables
$_SERVER - $HTTP_SERVER_VARS [removed] — Server and execution environment information
$GLOBALS — References all variables available in global scope
$_SESSION - $HTTP_SESSION_VARS [deprecated] — Session variables
$_FILES - $HTTP_POST_FILES [deprecated] — HTTP File Upload variables
$argc — The number of arguments passed to script
$argv — Array of arguments passed to script

Function

explode() — Split a string by string
implode() - Join array elements with a string
trim() - Strip whitespace (or other characters) from the beginning and end of a string
basename() - Returns trailing name component of path
dirname() - Returns a parent directory’s path
set_time_limit() - Limits the maximum execution time
time() - Return current Unix timestamp
is_bool() - Finds out whether a variable is a boolean
is_int() - Find whether the type of a variable is integer
is_float() - Finds whether the type of a variable is float
strtotime() - Parse about any English textual datetime description into a Unix timestamp
fopen() - Opens file or URL
fgets() - Gets line from file pointer
feof() - Tests for end-of-file on a file pointer
strlen() - Get string length
str_replace() - Replace all occurrences of the search string with the replacement string
isset() - Determine if a variable is set and is not NULL
strpo() - Find the position of the first occurrence of a substring in a string
DIRECTORY_SEPARATOR - windows(\ or /), unix(/)
PATH_SEPARATOR - windows(;), unix(:)
count() - Count all elements in an array, or something in an object
substr() - Return part of string, string substr ( string $string , int $start [, int $length ] )
memory_get_usage() - Returns the amount of memory allocated to PHP
ceil() - Round fractions up, ceil(3.1) => 4 ceil(-3.14) => -3
floor() - Round fractions down
round() - Rounds a float round(3.4) => 3 round(3.5) => 4
preg_match() - Perform a regular expression match int preg_match ( string $pattern , string $subject [, array &$matches [, int $flags = 0 [, int $offset = 0 ]]] )
preg_replace()
php_strip_whitespace() - Return source with stripped comments and whitespace
array_chunk() - Split an array into chunks
array_column() - Return the values from a single column in the input array
array_combine() - Creates an array by using one array for keys and another for its values
array_count_values() — Counts all the values of an array
array_keys() — Return all the keys or a subset of the keys of an array
array_map() — Applies the callback to the elements of the given arrays
array_shift() — Shift an element off the beginning of array
array_pop() — Pop the element off the end of array
array_intersect() — Computes the intersection of arrays
array_key_exists() — Checks if the given key or index exists in the array
array_unique() — Removes duplicate values from an array
array_unshift() — Prepend one or more elements to the beginning of an array
array_values() — Return all the values of an array
zlib:// – bzip2:// – zip:// — Compression Streams

$_SERVER

Just a PHP file to put on your local server (as I don't have enough memory) 

<?php 
	$indicesServer = array('PHP_SELF', 
	'argv', 
	'argc', 
	'GATEWAY_INTERFACE', 
	'SERVER_ADDR', 
	'SERVER_NAME', 
	'SERVER_SOFTWARE', 
	'SERVER_PROTOCOL', 
	'REQUEST_METHOD', 
	'REQUEST_TIME', 
	'REQUEST_TIME_FLOAT', 
	'QUERY_STRING', 
	'DOCUMENT_ROOT', 
	'HTTP_ACCEPT', 
	'HTTP_ACCEPT_CHARSET', 
	'HTTP_ACCEPT_ENCODING', 
	'HTTP_ACCEPT_LANGUAGE', 
	'HTTP_CONNECTION', 
	'HTTP_HOST', 
	'HTTP_REFERER', 
	'HTTP_USER_AGENT', 
	'HTTPS', 
	'REMOTE_ADDR', 
	'REMOTE_HOST', 
	'REMOTE_PORT', 
	'REMOTE_USER', 
	'REDIRECT_REMOTE_USER', 
	'SCRIPT_FILENAME', 
	'SERVER_ADMIN', 
	'SERVER_PORT', 
	'SERVER_SIGNATURE', 
	'PATH_TRANSLATED', 
	'SCRIPT_NAME', 
	'REQUEST_URI', 
	'PHP_AUTH_DIGEST', 
	'PHP_AUTH_USER', 
	'PHP_AUTH_PW', 
	'AUTH_TYPE', 
	'PATH_INFO', 
	'ORIG_PATH_INFO') ; 

	echo '<table cellpadding="10">' ; 
	foreach ($indicesServer as $arg) { 
	    if (isset($_SERVER[$arg])) { 
	        echo '<tr><td>'.$arg.'</td><td>' . $_SERVER[$arg] . '</td></tr>' ; 
	    } 
	    else { 
	        echo '<tr><td>'.$arg.'</td><td>-</td></tr>' ; 
	    } 
	} 
	echo '</table>' ; 

	/* 

	That will give you the result of each variable like (if the file is server_indices.php at the root and Apache Web directory is in E:\web) : 

	PHP_SELF    /server_indices.php 
	argv    - 
	argc    - 
	GATEWAY_INTERFACE    CGI/1.1 
	SERVER_ADDR    127.0.0.1 
	SERVER_NAME    localhost 
	SERVER_SOFTWARE    Apache/2.2.22 (Win64) PHP/5.3.13 
	SERVER_PROTOCOL    HTTP/1.1 
	REQUEST_METHOD    GET 
	REQUEST_TIME    1361542579 
	REQUEST_TIME_FLOAT    - 
	QUERY_STRING    
	DOCUMENT_ROOT    E:/web/ 
	HTTP_ACCEPT    text/html,application/xhtml+xml,application/xml;q=0.9,*;q=0.8 
	HTTP_ACCEPT_CHARSET    ISO-8859-1,utf-8;q=0.7,*;q=0.3 
	HTTP_ACCEPT_ENCODING    gzip,deflate,sdch 
	HTTP_ACCEPT_LANGUAGE    fr-FR,fr;q=0.8,en-US;q=0.6,en;q=0.4 
	HTTP_CONNECTION    keep-alive 
	HTTP_HOST    localhost 
	HTTP_REFERER    http://localhost/ 
	HTTP_USER_AGENT    Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.57 Safari/537.17 
	HTTPS    - 
	REMOTE_ADDR    127.0.0.1 
	REMOTE_HOST    - 
	REMOTE_PORT    65037 
	REMOTE_USER    - 
	REDIRECT_REMOTE_USER    - 
	SCRIPT_FILENAME    E:/web/server_indices.php 
	SERVER_ADMIN    myemail@personal.us 
	SERVER_PORT    80 
	SERVER_SIGNATURE    
	PATH_TRANSLATED    - 
	SCRIPT_NAME    /server_indices.php 
	REQUEST_URI    /server_indices.php 
	PHP_AUTH_DIGEST    - 
	PHP_AUTH_USER    - 
	PHP_AUTH_PW    - 
	AUTH_TYPE    - 
	PATH_INFO    - 
	ORIG_PATH_INFO    - 

	*/ 
?>

fopen()

fopen ( string $filename , string $mode [, bool $use_include_path = false [, resource $context ]] )


<?php
	$handle = fopen("/home/rasmus/file.txt", "r");
	$handle = fopen("/home/rasmus/file.gif", "wb");
	$handle = fopen("http://www.example.com/", "r");
	$handle = fopen("ftp://user:password@example.com/somefile.txt", "w");
?>

mode	Description
‘r’	Open for reading only; place the file pointer at the beginning of the file.
‘r+’	Open for reading and writing; place the file pointer at the beginning of the file.
‘w’	Open for writing only; place the file pointer at the beginning of the file and truncate the file to zero length. If the file does not exist, attempt to create it.
‘w+’	Open for reading and writing; place the file pointer at the beginning of the file and truncate the file to zero length. If the file does not exist, attempt to create it.
‘a’	Open for writing only; place the file pointer at the end of the file. If the file does not exist, attempt to create it. In this mode, fseek() only affects the reading position, writes are always appended.
‘a+’	Open for reading and writing; place the file pointer at the end of the file. If the file does not exist, attempt to create it. In this mode, fseek() only affects the reading position, writes are always appended.
‘x’	Create and open for writing only; place the file pointer at the beginning of the file. If the file already exists, the fopen() call will fail by returning FALSE and generating an error of level E_WARNING. If the file does not exist, attempt to create it.
‘x+’	Create and open for reading and writing; otherwise it has the same behavior as ‘x’.
‘c’	Open the file for writing only. If the file does not exist, it is created. If it exists, it is neither truncated (as opposed to ‘w’), nor the call to this function fails (as is the case with ‘x’). The file pointer is positioned on the beginning of the file. This may be useful if it’s desired to get an advisory lock (see flock()) before attempting to modify the file, as using ‘w’ could truncate the file before the lock was obtained (if truncation is desired, ftruncate() can be used after the lock is requested).
‘c+’	Open the file for reading and writing; otherwise it has the same behavior as ‘c’.

###p hp_strip_whitespace()

usage:

<?php
	// PHP comment here

	/*
	 * Another PHP comment
	 */

	echo        php_strip_whitespace(__FILE__);
	// Newlines are considered whitespace, and are removed too:
	do_nothing();
?>
###### The output:
<?php
		echo php_strip_whitespace(__FILE__); do_nothing();
	?>

###array_map()

1	<?php function cube($n) { return($n * $n * $n); } $a = array(1, 2, 3, 4, 5); $b = array_map("cube", $a); print_r($b); ?> //output: Array ( [0] => 1 [1] => 8 [2] => 27 [3] => 64 [4] => 125 )

zip

Example on how to read an entry from a ZIP archive (file "bar.txt" inside "./foo.zip"): 
<?php 

$fp = fopen('zip://./foo.zip#bar.txt', 'r'); 
if( $fp ){ 
	while( !feof($fp) ){ 
    	echo fread($fp, 8192); 
    } 
    fclose($fp); 
} 

?> 

Also, apparently, the "zip:" wrapper does not allow writing as of PHP/5.3.6. 	You can read http://php.net/ziparchive-getstream for further reference since the underlying code is probably the same.

A few “magical” PHP constants

Name	Description
LINE	The current line number of the file.
FILE	The full path and filename of the file with symlinks resolved. If used inside an include, the name of the included file is returned.
DIR	The directory of the file. If used inside an include, the directory of the included file is returned. This is equivalent to dirname(FILE). This directory name does not have a trailing slash unless it is the root directory.
FUNCTION	The function name.
CLASS	The class name. The class name includes the namespace it was declared in (e.g. Foo\Bar). Note that as of PHP 5.4 CLASS works also in traits. When used in a trait method, CLASS is the name of the class the trait is used in.
TRAIT	The trait name. The trait name includes the namespace it was declared in (e.g. Foo\Bar).
METHOD	The class method name.
NAMESPACE	The name of the current namespace.

The Man Who Can't Be Moved!

The most used built-in functions in php

PHP常用

Variables

Function

$_SERVER

fopen()

usage:

zip

A few “magical” PHP constants

yangfan.onion

人生太短, 只爱脚本语言, orz..

编程, 吃东西

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