PHP deletes the specified key in the Array array (full version, encapsulated into a function, with test code attached)_PHP tutorial

PHP deletes the specified key in the Array array (full version, encapsulated into a function, with test code attached)

Problem background: Arrays generally use key-value storage methods. Sometimes we need to delete the specified key and corresponding value. But I don’t know why, so many posts are talking about knowing the value and deleting the value, which almost misled me.

Attached is the complete version of the code I wrote:

function array_remove($data, $key){
    if(!array_key_exists($key, $data)){
        return $data;
    }
    $keys = array_keys($data);
    $index = array_search($key, $keys);
    if($index !== FALSE){
        array_splice($data, $index, 1);
    }
    return $data;

}
$data = array('name'=>'apple','age'=>12,'address'=>'ChinaGuangZhou');
$result = array_remove($data, 'name');
var_dump($result);

Additional instructions:

1. In fact, the problem lies in the array_search function. This function searches according to the value and gets the position. If it cannot be found, it returns NULL or false;

2, therefore, when searching for the location corresponding to the key by key, you need to find it in $keys. This is the reason for calling array_keys

3. Because the array_search function may return NULL and false, you must use absolute comparison! ＝＝

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