// Using the $records array from Example #1 $last_names = array_column($records, 'last_name', 'id'); print_r($last_names); ?> 以上例程会输出: Array ( [2135] => Doe [3245] => Smith [5342] => Jones [5623] => Doe ) 原文:http://php.net/manual/zh/function.array-column.php...
trigger_error("array_column() expects at least 2 parameters, {$argc} given", E_USER_WARNING); return null; } if (!is_array($params[0])) { trigger_error( 'array_column() expects parameter 1 to be array, ' . gettype($params[0]) . ' given', E_USER_WARNING ); return null; }...
array_search — 在数组中搜索给定的值,如果成功则返回相应的键名 array_shift — 将数组开头的单元移出数组 array_slice — 从数组中取出一段 array_splice — 把数组中的一部分去掉并用其它值取代 array_sum — 计算数组中所有值的和 array_udiff_assoc — 带索引检查计算数组的差集,用回调函数比较数据 array_...
foreach ($array as $key => $value) { if ($key !== array_search($value, $array)) { $isOneDimensional = false; break; } } if ($isOneDimensional) { echo “是一维数组”; } else { echo “不是一维数组”; } “` 以上是三种常用的方法来检查一个变量是否是一维数组。可以根据具体的需...
multi_dimensional.php <?php $users = [ ['id' => 1, 'name' => 'Alice'], ['id' => 2, 'name' => 'Bob'], ['id' => 3, 'name' => 'Charlie'] ]; // Search in specific column $hasBob = in_array('Bob', array_column($users, 'name')); echo $hasBob ? 'Bob exists'...
So for a three dimensional array where you are not sure about any of the keys actually existing<?php// instead of:$exists = array_key_exists($key1, $arr) && array_key_exists($key2, $arr[$key1]) && array_key_exists($key3, $arr[$key1][$key2]) ;// use:$exists = array_...
);var_dump($array["foo"]);var_dump($array[42]);var_dump($array["multi"]["dimensional"]["array"]);?> 程序输出: string(3)"bar"int(24)string(3)"foo" 注意: 方括号和花括号可以互换使用来访问数组单元(例如 $array[42] 和 $array{42} 在上例中效果相同)。
Are you searching the value in a 2 dimensional array? why you think there's a need for nested loop? for a 1 dimensional array we don't need nested loop : ) 22nd Nov 2019, 4:08 AM Ipang 0 AshLet me see your code first. I don't even know how far you have walked through this...
This is what I recently did to quickly create a two dimensional array (10x10), initialized to 0:<?php $a = array_fill(0, 10, array_fill(0, 10, 0));?>This should work for as many dimensions as you want, each time passing to array_fill() (as the 3rd argument) another array_...
Array ( [0] => an apple [1] => a banana [2] => the Earth [3] => John ) 4· multi-dimensional <? function callback($a, $b) { return strcmp($a["fruit"], $b["fruit"]); } $array[0]["fruit"] = "lemons"; $array[1]["fruit"] = "apples"; $array[2]["fruit"] =...