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

<?php
$tmp = '324';
$arr = array(
'0' => '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, 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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