PHP 7.0.6 Released

preg_grep

(PHP 4, PHP 5, PHP 7)

preg_grepReturn array entries that match the pattern

Description

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

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

Parameters

pattern

The pattern to search for, as a string.

input

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 Values

Returns an array indexed using the keys from the input array.

Examples

Example #1 preg_grep() example

<?php
// return all array elements
// containing floating point numbers
$fl_array preg_grep("/^(\d+)?\.\d+$/"$array);
?>

See Also

User Contributed Notes

Daniel Klein
3 years ago
A shorter way to run a match on the array's keys rather than the values:

<?php
function preg_grep_keys($pattern, $input, $flags = 0) {
    return
array_intersect_key($input, array_flip(preg_grep($pattern, array_keys($input), $flags)));
}
?>
keithbluhm at gmail dot com
6 years ago
Run a match on the array's keys rather than the values:

<?php

function preg_grep_keys( $pattern, $input, $flags = 0 )
{
   
$keys = preg_grep( $pattern, array_keys( $input ), $flags );
   
$vals = array();
    foreach (
$keys as $key )
    {
       
$vals[$key] = $input[$key];
    }
    return
$vals;
}

?>
vickyssj7 at gmail dot com
1 year ago
A very simple example to match multiple "."(dot) in an array value:-

<?php

     $array
= array("23.32","22","12.009","23.43.43");
    
print_r(preg_grep("/^(\d+)?\.\d+\.\d+$/",$array));

?>
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