How to delete elements in an array in php

There are many ways to delete specified elements in an array in PHP. Here are a few common methods.

1. unset function
   The unset function can delete the specified element in the array or the entire array.

   $array = array(1, 2, 3, 4, 5); unset($array[2]); // 删除数组中下标为 2 的元素 print_r($array); // 输出：Array ( [0] => 1 [1] => 2 [3] => 4 [4] => 5 )

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2. array_splice function
   array_splice function can delete the elements in the specified interval in the array and return the deleted element array.

   $array = array(1, 2, 3, 4, 5); $removed = array_splice($array, 2, 1); // 从下标为 2 的元素开始删除 1 个元素 print_r($array); // 输出：Array ( [0] => 1 [1] => 2 [2] => 4 [3] => 5 ) print_r($removed); // 输出：Array ( [0] => 3 )

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3. array_diff function
   array_diff function can return the difference set of two arrays, thereby achieving the effect of deleting the specified element.

   $array = array(1, 2, 3, 4, 5); $removed = array_diff($array, array(3)); // 删除值为 3 的元素 print_r($removed); // 输出：Array ( [0] => 1 [1] => 2 [3] => 4 [4] => 5 )

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4. array_filter function
   array_filter function can filter the elements in the array based on the return value of the callback function, thereby achieving the effect of deleting the specified element.

   // 根据键值来判断是否删除元素 $array = array(1, 2, 3, 4, 5); $removed = array_filter($array, function($val) { return $val !== 3; }); print_r($removed); // 输出：Array ( [0] => 1 [1] => 2 [3] => 4 [4] => 5 ) // 根据键名来判断是否删除元素 $array = array('a' => 1, 'b' => 2, 'c' => 3); $removed = array_filter($array, function($key) { return $key !== 'c'; }, ARRAY_FILTER_USE_KEY); print_r($removed); // 输出：Array ( [a] => 1 [b] => 2 )

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The above are several commonly used methods to delete array elements. You need to choose according to the actual situation when using them.

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