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Summary of usage of how to delete an element in an array in php
Summary of usage of how to delete an element in an array in php
Remove the value of the $tmp element from the array
<?php $tmp = '324'; $arr = array('0' => '321','1' => '322','2' => '323','3' => '324','4' => '325','5' => '326', );
Code
<?php
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
)reset the index , adding a sentence
<?php
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
<?php
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 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);
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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