mb_stristr
(PHP 5 >= 5.2.0)
mb_stristr — Finds first occurrence of a string within another, case insensitive
Description
$haystack
, string $needle
[, bool $before_needle
= false
[, string $encoding
= mb_internal_encoding()
]] )
mb_stristr() finds the first occurrence of
needle
in haystack
and returns the portion of haystack
.
Unlike mb_strstr(),
mb_stristr() is case-insensitive.
If needle
is not found, it returns FALSE
.
Parameters
-
haystack
-
The string from which to get the first occurrence of
needle
-
needle
-
The string to find in
haystack
-
before_needle
-
Determines which portion of
haystack
this function returns. If set toTRUE
, it returns all ofhaystack
from the beginning to the first occurrence ofneedle
(excluding needle). If set toFALSE
, it returns all ofhaystack
from the first occurrence ofneedle
to the end (including needle). -
encoding
-
Character encoding name to use. If it is omitted, internal character encoding is used.
Return Values
Returns the portion of haystack
,
or FALSE
if needle
is not found.
See Also
- stristr() - Case-insensitive strstr
- strstr() - Find the first occurrence of a string
- mb_strstr() - Finds first occurrence of a string within another
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Коментарии
Be aware that if needle is an empty string, mb_stristr return the haystack by default.
For exemple:
<?php
if (mb_stristr("foo", "")) {
echo "We enter in condition";
}
?>
Because in the above exemple the return of mb_stristr is "foo".
So if we do not want this kind of behaviour, we must set the third argument, ($before_needle) to true.
<?php
if (mb_stristr("foo", "", true)) {
echo "We do not enter in condition";
}
?>
It can be useful to know it, specially when needle is dynamic.