How to delete the value of a one-dimensional array in php

php method to delete the value of a one-dimensional array: 1. Delete the value of a one-dimensional array through a custom for loop; 2. Use "array_search" and "array_splice" to achieve deletion.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

php deletes a value element in a one-dimensional array Operation method

1. Write your own for loop

Remove the value of the $tmp element from the array

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

Code

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

At this time

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

To reset the index, add a sentence

foreach( $arr as $k=>$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

foreach( $arr as $k=>$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 PHP’s built-in functions, because they are implemented in C and are more efficient than writing them yourself.

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 )

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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