Detailed explanation of regular expression preg_grep function

This article mainly shares with you the detailed explanation of the regular expression preg_grep function. preg_grep returns an array composed of elements matching the pattern pattern in the given array input. Hope it helps everyone.

##patternRegular expression Formula, pattern to be searched, string form.inputInput array.flagsIf set to PREG_GREP_INVERT, this function returns an array of elements in the input array that do not match the given pattern pattern.

$array = array(1.2, 1.3, 1, 11.1);$fl_array = preg_grep("/^(\d+)?\.\d+$/", $array);
var_dump($fl_array); //array(2) { [0]=> float(1.2) [1]=> float(1.3) }$fl_array = preg_grep("/^(\d+)?\.\d+$/", $array);
var_dump($fl_array); //array(1) { [2]=> int(1) }

Parameter	Description

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