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

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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; => &#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;,
);

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

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);
?>

The result at this time

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

2 .Prefer 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);

The result at this time

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

Best Practices

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

Results

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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