stristr
(PHP 4, PHP 5)
stristr — Case-insensitive strstr()
说明
string stristr
( string $haystack
, string $needle
, bool $before_needle
)
Returns all of haystack
from the first
occurrence of needle
to the end.
参数
-
haystack
-
-
needle
-
If needle
is not a string, it is converted to
an integer and applied as the ordinal value of a character.
-
before_needle
-
If TRUE (the default is FALSE), stristr()
returns the part of the haystack
before the
first occurence of the needle
.
needle
and haystack
are examined in a case-insensitive manner.
返回值
Returns the matched substring. If needle
is not
found, returns FALSE.
范例
Example#1 stristr() example
<?php
$email = 'USER@EXAMPLE.com';
echo stristr($email, 'e'); // outputs ER@EXAMPLE.com
echo stristr($email, 'e', true); // outputs US
?>
Example#2 Testing if a string is found or not
<?php
$string = 'Hello World!';
if(stristr($string, 'earth') === FALSE) {
echo '"earth" not found in string';
}
// outputs: "earth" not found in string
?>
Example#3 Using a non "string" needle
<?php
$string = 'APPLE';
echo stristr($string, 97); // 97 = lowercase a
// outputs: APPLE
?>