Question

php 中二维数组中某个值是否与提供值相等

比如这个二维数组是
$user = array("ID"=>array( "0","1","2"),"Day"=>array("5");
判断另一个提供值是否与数组ID中某值相等

Answer 1

$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';

Answer 2

用php函数in_array()
:检查数组中是否存在某个值
例如：
<?php
$os = array("Mac", "NT", "Irix", "Linux");
if (in_array("Irix", $os)) {
echo "Got Irix";
}
if (in_array("mac", $os)) {
echo "Got mac";
}
?>

Answer 3

方法一：
$user = array("ID"=>array( "0","1","2"),"Day"=>array("5")); //二维数组
$arrID = $user["ID"];
$str = "2"; //要判断的值

foreach ($arrID as $value){ //遍历数组arrID
if ($str == $value){ //如果要判断的值在数组中，则退出
echo "$str in array";
break;
}
}

方法二：
$user = array("ID"=>array( "0","1","2"),"Day"=>array("5")); //二维数组
$str = "1"; //要判断的值
foreach ($user as $key => $arrKey){ //遍历二维数组
if ($key =="ID" ){ //如果Key=ID
foreach ( $arrKey as $value){//遍历key=ID的数组，在遍历前还可以加一个是否为数组的判断
if ($value == $str){ //如果要判断的值在数组中，则退出
echo "$str is in the array";
break;
}
}
}
}

Answer 4

不太明白你的意思，请清楚描述你的问题方便为你解答