strrpos
Description
Syntax
strrpos(
string $haystack,
string $needle,
int $offset = 0
): int|falseParameters
haystack
The string to search in.
needle
The string to search for.
offset
If zero or positive, the search is performed left to right skipping the first offset bytes of the haystack.
If negative, the search starts offset bytes from the right instead of from the beginning of haystack. The search is performed right to left, searching for the first occurrence of needle from the selected byte.
NOTE: This is effectively looking for the last occurrence of needle before the last offset bytes.
Return
Returns the position where the needle exists relative to the beginning of the haystack string (independent of search direction or offset).
Returns false if the needle was not found.
NOTE: String positions start at 0, and not 1.
WARNING: This function may return Boolean false, but may also return a non-Boolean value which evaluates to false. Use the === operator for testing the return value of this function.
Examples
1 · haystack needle
<? $haystack = 'CASEcase'; $needle = 's'; $return = strrpos($haystack, $needle); echo $return; ?>
6
2 · offset · negative
<? $haystack = 'CASEcase'; $needle = 's'; $offset = -4; $return = strrpos($haystack, $needle, $offset); var_export($return); ?>
false
3 · offset · non-negative
<? $haystack = 'CASEcase'; $needle = 's'; $offset = 4; $return = strrpos($haystack, $needle, $offset); echo $return; ?>
6
4 · return
<?
// use identity operator (===) instead of comparison operator (==) to test return
$haystack = 'abc';
$needle = 'a';
$return = strrpos($haystack, $needle);
if($return === false)
{
echo "not found";
}
else
{
echo "found";
}
?>found
Links
String
- addcslashes
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- number_format
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- parse_str
- printf
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