How to delete a value element in a one-dimensional array in php

php method to delete a value element in a one-dimensional array: 1. Use the for loop statement and the function [array_merge()] to remove the value, the code is [$arr = array_merge($arr)]; 2. Use the function [array_splice] to automatically reset the sequence value.

php method to delete a value element in a one-dimensional array:

1. Write it yourself for loop

Remove$tmpthe value of this element from 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); ?>

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, wherearray_spliceautomatically 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);

Related learning recommendations:php programming(video)

The above is the detailed content of How to delete a value element in a one-dimensional array in php. For more information, please follow other related articles on the PHP Chinese website!