Summary of usage of how to delete an element in an array in php

Remove the value of the $tmp element from the array

 '321','1' => '322','2' => '323','3' => '324','4' => '325','5' => '326',
);

Code

$v) {
    if($tmp == $v) unset($arr[$k]);
}
print_r($arr);
?>

At this time

Array(
    [0] => 321
    [1] => 322
    [2] => 323
    [4] => 325
    [5] => 326
)

reset the index , adding a sentence

$v) {
    if($tmp == $v) unset($arr[$k]);
}
$arr = array_values($arr);
print_r($arr);
?>

The result at this time

Array(
    [0] => 321
    [1] => 322
    [2] => 323
    [3] => 325
    [4] => 326
)

array_merge() can also achieve the same effect

$v) {
    if($tmp == $v) unset($arr[$k]);
}
$arr = array_merge($arr);
print_r($arr);
?>

The result at this time

Array(
    [0] => 321
    [1] => 322
    [2] => 323
    [3] => 325
    [4] => 326
)

2. Prioritize using the functions that come with PHP, because they are implemented in C and are more efficient than writing them yourself.

1. Use array_search and array_splice, where array_splice automatically resets the sequence value.

$key=array_search($tmp ,$arr);
array_splice($arr,$key,1);
var_dump($arr);

Result at this time

Array(
    [0] => 321
    [1] => 322
    [2] => 323
    [3] => 325
    [4] => 326
)

1. Best Practice

$arr = array_merge(array_diff($arr, array($tmp)));
var_dump($arr);

Result

Array(
    [0] => 321
    [1] => 322
    [2] => 323
    [3] => 325
    [4] => 326
)

Here, if the array elements are complex data structures, comparison can also be achieved. Of course the data itself is still one-dimensional.
In the above example, $tmp is a value. If $tmp is an array or other complex data structure, delete all elements contained in $tmp from $array. The above method is also valid.

$arr = array_merge(array_diff($arr, $tmp));
var_dump($arr);

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