<?php
$json = '[{"name":"Juar","Sex":"Male","ID":"1100"},{"name":"Maria","Sex":"Female","ID":"2513"},{"name":"Pedro","Sex":"Male","ID":"2211"}]';
$array = json_decode($json,1);
$ID = "ar";
$expected = array_filter($array, function ($var) use ($ID) {
    if (strpos($var['name'],$ID) !== false){
        echo $var['name'];
        return true;
    }

});
print_r($expected);
?>