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@ 2017-10-17T22:49:25Z

<?php

$class = array
(
    array(
            "s1" => 6,
            "s2" => 37
        ),
    array
        (
            "s1" => 8,
            "s2" => 11
        ),
    array(
            "s1" => 11,
            "s2" => 48
        )
);

$id = 11;

foreach ($class as $key => $value) {
    if(!in_array($id, $value)){
        unset($class[$key]);
    }
}

var_dump($class);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
in_array: documentation ( source)

preferences:dark modelive previewkey bindings

155.12 ms | 405 KiB | 5 Q