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array preg_grep ( string $pattern , array $input [, int $flags = 0 ] )

<?php
$array = array(1, 2, 3.4, 53, 7.9);
// Return all elements that are floating point numbers
$fl_array = preg_grep("/^(\d+)?\.\d+$/", $array);
print_r($fl_array);
?>

Array
(
    [2] => 3.4
    [4] => 7.9
)