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PHP如何2维数组循环时把某个kEy的值相加

返回数组中所有的key值: $keys = array_keys($array) 2.求出总和: $sum = array_sum($keys)$sum为所有key的总和

php数组根据某一个键值,把相同键值的合并生成一个新的二维数组 源数据: $infos = array( array( 'a' => 36, 'b' => 'xa', 'c' => '2015-08-28 00:00:00', 'd' => '2015/08/438488a00b3219929282e3652061c2e3.png' ), array( 'a' => 3, 'b' => ...

$value = '';//假设value是你要判断的值 $user = array("ID"=>array( "0","1","2"),"Day"=>array("5"); if(in_array($value,$user)) echo '$value与数组中的某值相等';

试编写代码如下: 运行结果: Array ( [201301] => 3333 [201302] => 372 )

$b=array();//空数组foreach ($arr as $a){ $b[]=$a['100864'];//添加值}print_r($b);

121

使用PHP内置的array_combine()方法就好了 如下示例: $arry_a = ['a','b','c'];$arry_b = ['AA','BB','CC'];var_dump(array_combine($arry_a, $arry_b));

array_slice($arr,1,-1);截取出来再改; 参考例子,完整写法: $ar = array( array(1 => 'a', 2 => 50, 3 => 60, 4 => 'long', 5 => 'zzz', 6 => 'kkk', 7 => 'ooo'), array(1 => 'b', 2 => 60, 3 => 70, 4 => 'king', 5 => 'lll', 6 => 'ttt', 7...

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