php remove a row from array

We often need to operate arrays in PHP development, and sometimes we need to remove a certain row in the array. So, how to do it? Let’s take a look at some commonly used methods.

Method 1:

We can use a foreach loop to traverse the array to remove a specified row. The code is as follows:

foreach($arr as $key=>$value){
    if($value == $remove_val){
        unset($arr[$key]);
    }
}

Among them, $arr is the array to be processed, and $remove_val is an element in the row to be removed.

Method 2:

Another commonly used method is to use the array_filter function to filter. The code is as follows:

$arr = array_filter($arr, function($value) use ($remove_val){
    return $value != $remove_val;
});

This method is relatively simple, directly using PHP's built-in functions, and the code is shorter.

Method 3:

You can also use the array_diff function to filter the rows to be removed, for example:

$remove_row = array('a', 'b', 'c'); 
$new_arr = array_diff($arr, $remove_row);

This method is suitable for elements to be removed in one row The situation in is less suitable for situations where there are multiple elements in the row to be removed.

Summary:

The above are some common methods for removing a row of an array in PHP. Which method to choose depends on the structure of the array and the structure of the row that needs to be removed. In actual development, you can also innovate according to your own needs.

Extra Tip:

In PHP, removing array elements may also cause the original index to be disrupted, so sometimes we need to use the following method to remove the array Reindex.

$arr = array_values($arr);

This re-indexes the array and makes the array index contiguous.

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