The first occurrence of a strstr-lookup string
String Strstr (String $haystack, mixed $needle [, bool $before _needle = false])
Note 1: $haystack is a string of characters, $needle is the string being looked up. The function is case-sensitive.
Note 2: The return value starts from needle to the end.
Note 3: For $needle, if it is not a string, it is used as the ordinal of the character as an integer.
Note 4:before_needle If true, the previous thing is returned.
Copy CodeThe code is as follows:
$email = ' yuxiaoxiao@example.com ';
$domain = Strstr ($email, ' @ ');
Echo $domain; Print @example. com
$user = Strstr ($email, ' @ ', true); From PHP 5.3.0 onwards
Echo $user; Print Yuxiaoxiao
?>
Second, stristr strstr case-insensitive version
Strpos-Find where the string first appears
int Strpos (string $haystack, mixed $needle [, int $offset = 0])
Note 1: The optional offset parameter can be used to specify which character in the haystack to start the lookup. The number position returned is relative to the starting position of the haystack.
Iv. substr-Returns a substring of a string
String substr (string $string, int $start [, int $length])
$rest = substr ("abcdef",-1); Return "F"
Note 1: If Start is non-negative, the returned string starts at the start position of string and is calculated from 0. For example, in the string "ABCdef", the character at position 0 is "a", the string for position 2 is "C", and so on.
Note 2: If start is a negative number, the returned string starts at the end of the string, starting at the start of the first character.
Note 3: Returns FALSE if the length of the string is less than or equal to start.
Length
Note 4: If a positive length is provided, the returned string will contain a maximum of length characters (depending on the length of the string) starting at start.
Note 5: If the length of a negative number is provided, then many of the characters at the end of the string will be omitted (if start is negative, count from the tail of the string). If start is not in this text, an empty string is returned.
Note 6: If a length of value 0,false or NULL is provided, an empty string is returned.
Note 7: If length is not provided, the returned substring starts at the start position until the end of the string.
Copy CodeThe code is as follows:
$rest = substr ("abcdef", 0,-1); Back to "ABCDE"
$rest = substr ("ABCdef", 2,-1); Back to "CDE"
$rest = substr ("ABCdef", 4,-4); Return ""
$rest = substr ("ABCdef",-3,-1); Return to "de"
?>
V. STRRCHR-Find the last occurrence of a specified character in a string
String STRRCHR (String $haystack, mixed $needle)
The function returns a portion of the haystack string, starting at the last occurrence of needle, until the end of haystack.
Vi. Strripos-Calculates the position of the last occurrence of the specified string in the target string (case insensitive)
Vii. Stripos-Find where the string first appears (not case-sensitive)
Viii. Strrpos-Calculates the position of the last occurrence of the specified string in the target string
http://www.bkjia.com/PHPjc/325605.html www.bkjia.com true http://www.bkjia.com/PHPjc/325605.html techarticle the first occurrence of the strstr-lookup string Strstr string (string $haystack, mixed $needle [, bool $before _needle = false]) Note 1: $haystack Is the party string, $needle is checked ...
