Return array entries that match the pattern
Syntax
preg_grep(string $pattern, array $array, int $flags = 0): array|false
Parameters
patternThe pattern to search for, as a string.
arrayThe input array.
flagsIf set to PREG_GREP_INVERT, this function returns the elements of the input array that do not match the given pattern.
Return
Returns an array indexed using the keys from the array array, or false on failure.
Examples
1 · pattern array
<? $pattern = "#^(\d+)?\.\d+$#"; $array = array(0, 1.1, 22.22, 333.333, 4); $return = preg_grep($pattern, $array); print_r($return); ?>
Array
(
[1] => 1.1
[2] => 22.22
[3] => 333.333
)
2 · flags
<? $pattern = "#^(\d+)?\.\d+$#"; $array = array(0, 1.1, 22.22, 333.333, 4); $flags = PREG_GREP_INVERT; $return = preg_grep($pattern, $array, $flags); print_r($return); ?>
Array
(
[0] => 0
[4] => 4
)
