mb_stristr
(PHP 5 >= 5.2.0)
mb_stristr — Finds first occurrence of a string within another, case insensitive
Описание
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.
Список параметров
- haystack
-
The string from which to get the first occurrence of needle
- needle
-
The string to find in haystack
- part
-
Determines which portion of haystack this function returns. If set to TRUE, it returns all of haystack from the beginning to the first occurrence of needle . If set to FALSE, it returns all of haystack from the first occurrence of needle to the end, Default value is FALSE.
- encoding
-
Character encoding name to use. If it is omitted, internal character encoding is used.
Возвращаемые значения
Returns the portion of haystack , or FALSE if needle is not found.
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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.