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Constant

Pre-defined constants:
__DIR__: Returns the directory where the current file resides. Returns the directory where the contained file is located if it is in the included file. Note: Unless the current directory is the root directory, the returned string is not followed by A/
__FILE__: Returns the path and file name of the current file. If the included file path and filename are returned in the included file

Variable

Pre-defined variables:

$_server:http://php.net/manual/zh/reserved.variables.server.php

Function

DirName: Returns the parent directory in the given path. If no/is returned in the given path. Represents the current directory, otherwise returns the remaining string after the last/and subsequent string in the given path is removed

STRNCMP ($str 1, $str 2, $len): Compares several characters at the beginning of a two string. If $STR1 is greater than $STR2 returns greater than 0, $str 1 less than $STR2 returns less than 0. Equal return 0

substr_compare:http://php.net/manual/zh/function.substr-compare.php

Strpos: Find where the string first appears

SUBSTR: Returns a substring of a string

RTrim: Delete whitespace characters (or other characters) at the end of a string

Func_get_args: Returns an array containing a list of function arguments

Array_shift: Moves the cell at the beginning of the array to a group

Get_class: Returns the class name of the object

Realpath: Returns normalized absolute pathname, failure returns false (e.g. file does not exist)

Is_dir: To determine whether a given file name is a directory, is to return true, not to return false

Date_default_timezone_set: Sets the default time zone for all datetime functions in a script

Method_exists: Checks whether the method of the class exists. If the class is not known, the auto-load function is called

Strlen: Gets the length of the string. Returns 0 if the string is empty

Explode: Splitting another string with one string

str_replace:http://php.net/manual/zh/function.str-replace.php

Ucwords: Converts the first letter of each word in a string to uppercase

Type

String

Single quote: ' to express ' need to add backslash \ Escape. Express backslash \ Self with two backslashes \ \

Reflection

http://php.net/manual/zh/book.reflection.php

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