Does php two-dimensional array have a certain value?

PHP determines whether the two-dimensional array contains a certain value:

PHP can use loop traversal to compare each value in the two-dimensional array with the query Values ​​are compared to determine whether a certain value is contained in the two-dimensional array.

$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;   
}

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