我使用in_array()来检查一个值是否存在于如下数组中，
$a = array("Mac", "NT", "Irix", "Linux");
if (in_array("Irix", $a))
{
echo "Got Irix";
}
//print_r($a);
但是对于一个多维数组(下面)——我如何检查这个值是否存在于多数组中?
$b = array(array("Mac", "NT"), array("Irix", "Linux"));
print_r($b);
或者我不应该使用in_array()当涉及到多维数组?
当前回答
你可以这样用
$result = array_intersect($array1, $array2);
print_r($result);
http://php.net/manual/tr/function.array-intersect.php
其他回答
我找到了一个非常简单的解决方法:
如果你的数组是:
Array
(
[details] => Array
(
[name] => Dhruv
[salary] => 5000
)
[score] => Array
(
[ssc] => 70
[diploma] => 90
[degree] => 70
)
)
然后代码将像这样:
if(in_array("5000",$array['details'])){
echo "yes found.";
}
else {
echo "no not found";
}
那么array_search呢?根据https://gist.github.com/Ocramius/1290076的说法，似乎比foreach快得多。
if( array_search("Irix", $a) === true)
{
echo "Got Irix";
}
我正在寻找一个函数，它可以让我在数组(干草堆)中搜索字符串和数组(如针)，所以我通过@jwueller添加到答案中。
这是我的代码:
/**
* Recursive in_array function
* Searches recursively for needle in an array (haystack).
* Works with both strings and arrays as needle.
* Both needle's and haystack's keys are ignored, only values are compared.
* Note: if needle is an array, all values in needle have to be found for it to
* return true. If one value is not found, false is returned.
* @param mixed $needle The array or string to be found
* @param array $haystack The array to be searched in
* @param boolean $strict Use strict value & type validation (===) or just value
* @return boolean True if in array, false if not.
*/
function in_array_r($needle, $haystack, $strict = false) {
// array wrapper
if (is_array($needle)) {
foreach ($needle as $value) {
if (in_array_r($value, $haystack, $strict) == false) {
// an array value was not found, stop search, return false
return false;
}
}
// if the code reaches this point, all values in array have been found
return true;
}
// string handling
foreach ($haystack as $item) {
if (($strict ? $item === $needle : $item == $needle)
|| (is_array($item) && in_array_r($needle, $item, $strict))) {
return true;
}
}
return false;
}
你总是可以序列化你的多维数组并执行strpos:
$arr = array(array("Mac", "NT"), array("Irix", "Linux"));
$in_arr = (bool)strpos(serialize($arr),'s:4:"Irix";');
if($in_arr){
echo "Got Irix!";
}
我使用的各种文档:
(大小写敏感) serialize () 类型杂耍或(bool)
你可以这样用
$result = array_intersect($array1, $array2);
print_r($result);
http://php.net/manual/tr/function.array-intersect.php
