Detailed explanation of steps to delete value elements in one-dimensional array in PHP

This time I will bring you PHP deletionOne-dimensional arrayDetailed explanation of the steps of median element, PHPNotesWhat are the precautions for deleting the median element of one-dimensional array? The following is a practical case , let’s take a look.

1. Write your own for loop

Remove the value of the $tmp element from the array

<?php $tmp = &#39;324&#39;;
$arr = array(
&#39;0&#39; => '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);
?>

At this time the result

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);
?>

At this time the result

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);

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

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