How to search a substring in PHP array using regExp - regex

Question

$array = array(
array('foo_test1','demo_test1'),
array('foo_test2','demo_test2'),
array('blah_test1','exp_test1'),
array('blah_test2','exp_test2'),
array('foo_test3','demo_test3')
)
How to get all subarray which contains foo substring with its value using php and regExp.
Expected Output:
$array = array(
array('foo_test1','demo_test1'),
array('foo_test2','demo_test2'),
array('foo_test3','demo_test3')
)

Answer 1

You should be able to do it with
preg_grep($pattern,$array)

Answer 2

$input = array( /* your array */ );
$output = array();
foreach ( $input as $data ) {
$len = length($data);
for ( $i = 0; $i < $len; ++$i ) {
if ( strpos($data[$i], 'foo') > -1 ) {
$output[] = $data;
break;
}
}
}

Answer 3

$array = array(
array('foo_test1','demo_test1'),
array('foo_test2','demo_test2'),
array('blah_test1','exp_test1'),
array('blah_test2','exp_test2'),
array('foo_test3','demo_test3')
);
$search = 'foo';
$res = array();
foreach ($array as $arr) {
foreach ($arr as $value) {
if (preg_match('~'.preg_quote($search,'~').'~',$value)) {
// if one of the values in that array
// has the search word in it...
$res[] = $arr; break;
// push it into the $res and break
// the inner foreach loop
}
}
}
print_r($res);