php判断多维数组是否存在某个值

$os = array("Mac", "NT", "Irix", "Linux");

echo “（1）”;
if (in_array("Irix", $os)) {
    echo "Got Irix";
}
if (in_array("mac", $os)) {//in_array() 是区分大小写的
    echo "Got mac";
}

$a = array('1.10', 12.4, 1.13);
echo "(2)";

if (in_array('12.4', $a, true)) {//in_array() 严格类型检查
    echo "'12.4' found with strict checkn";
}
if (in_array(1.13, $a, true)) {
    echo "1.13 found with strict checkn";
}
 

$a = array(array('p', 'h'), array('p', 'r'), 'o');
echo "(3)";

if (in_array(array('p', 'h'), $a)) {
    echo "'ph' was foundn";

}

if (in_array(array('f', 'i'), $a)) {//in_array() 中用数组作为 needle
    echo "'fi' was foundn";
}
if (in_array('o', $a)) {
    echo "'o' was foundn";
}
?>

程序运行结果是：

(1)Got Irix

(2)1.13 found with strict check

(3)'ph' was found    'o' was found

$arr = array(
   array('a', 'b'),
   array('c', 'd')
);
 
in_array('a', $arr); // 此时返回的永远都是 false
deep_in_array('a', $arr); // 此时返回 true 值
 
function deep_in_array($value, $array) { 
    foreach($array as $item) { 
        if(!is_array($item)) { 
            if ($item == $value) {
                return true;
            } else {
                continue; 
            }
        } 
         
        if(in_array($value, $item)) {
            return true;    
        } else if(deep_in_array($value, $item)) {
            return true;    
        }
    } 
    return false; 
}