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

韦小宝
Release: 2023-03-19 20:22:02
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The following editor will share with you an article on how to delete a certain value element in a one-dimensional array in PHP. It has a good reference and value for learning PHP. I hope it will be helpful to everyone. If you are interested in PHP, please follow the editor to have a look

1. Write your own for loop

Remove $tmp from the array The value of the element

<?php
$tmp = &#39;324&#39;;
$arr = array(
&#39;0&#39; => &#39;321&#39;,
&#39;1&#39; => &#39;322&#39;,
&#39;2&#39; => &#39;323&#39;,
&#39;3&#39; => &#39;324&#39;,
&#39;4&#39; => &#39;325&#39;,
&#39;5&#39; => &#39;326&#39;,
);
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Code

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

Array
(
 [0] => 321
 [1] => 322
 [2] => 323
 [4] => 325
 [5] => 326
)
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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);
?>
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The result at this time

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

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);
?>
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The result at this time

Array
(
 [0] => 321
 [1] => 322
 [2] => 323
 [3] => 325
 [4] => 326
)
Copy after login
Copy after login
Copy after login
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2. Prioritize using the functions that come with PHP, 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);
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Result at this time

Array
(
 [0] => 321
 [1] => 322
 [2] => 323
 [3] => 325
 [4] => 326
)
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Copy after login
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Best Practice

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

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

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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The above PHP method of deleting a certain value element in a one-dimensional array is all the content shared by the editor. I hope it can give you a reference!

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