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preg_grep

Description

The preg_grep of PCRE for PHP return array entries that match the pattern.

Syntax

preg_grep(string $pattern, array $array, int $flags = 0): array|false

Parameters

pattern

The pattern to search for, as a string.

array

The input array.

flags

If 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
)