PHP preg_grep() function

Author：Eve Cole Update Time：2024-12-28 15:12:02

The preg_grep function is used to return array entries that match a pattern.

grammar

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

Returns an array consisting of the elements in the given array input that match pattern.

Parameter description:

$pattern: The pattern to be searched, in string form.

$input: input array.

$flags: If set to PREG_GREP_INVERT, this function returns an array of elements in the input array that do not match the given pattern pattern.

Example

Returns the specified matching elements in the array:

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

The execution result is as follows:

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

It can be seen that preg_grep only returns the floating point numbers in the array.