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法律研究使用 PHP 將字串分割為陣列後，如何移除所有空值？
array_filter() 或 preg_split() 中的 PREG_SPLIT_NO_EMPTY 選項可用於在字串分割為陣列後，從其移除空值 −
示例
<?php $_POST['tag'] = ",abc,defg,,,hijk,lmnop,,0,,"; echo "--- version 1: array_filter ----
"; // note that this also filters "0" out, since (bool)"0" is FALSE in php // array_filter() called with only one parameter tests each element as a boolean value $tags = array_filter( explode(",", $_POST['tag']) ); var_dump($tags); echo "--- version 2: array_filter/strlen ----
"; // this one keeps the "0" element // array_filter() calls strlen() for each element of the array and tests the result as a boolean value $tags = array_filter( explode(",", $_POST['tag']), 'strlen' ); var_dump($tags); echo "--- version 3: PREG_SPLIT_NO_EMPTY ----
"; $tags = preg_split('/,/', $_POST['tag'], -1, PREG_SPLIT_NO_EMPTY); var_dump($tags);
輸出
將生成以下輸出 −
--- version 1: array_filter ---- array(4) { [1]=> string(3) " abc " [2]=> string(4) " defg "
[5]=> string(4) "hijk" [6]=> string(5) "lmnop" } --- version 2: array_filter/strlen ---- array(5)
{ [1]=> string(3) "abc" [2]=> string(4) "defg" [5]=> string(4) "hijk" [6]=> string(5) "lmnop" [8]=>
string(1) "0" } --- version 3: PREG_SPLIT_NO_EMPTY ---- array(5) { [0]=> string(3) "abc" [1]=>
string(4) "defg" [2]=> string(4) "hijk" [3]=> string(5) "lmnop" [4]=> string(1) "0" }
更新於： 09-4-2020
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