php判断多维数组是否存在某个值_PHP教程

$os = array("Mac", "NT", "Irix", "Linux");

echo “（1）”;
if (in_array("Irix", $os)) {
echo "Got Irix";
}
if (in_array("mac", $os)) {//in_array() 是区分大小写的
echo "Got mac";
}

$a = array('1.10', 12.4, 1.13);
echo "(2)";

if (in_array('12.4', $a, true)) {//in_array() 严格类型检查
echo "'12.4' found with strict checkn";
}
if (in_array(1.13, $a, true)) {
echo "1.13 found with strict checkn";
}

$a = array(array('p', 'h'), array('p', 'r'), 'o');
echo "(3)";

if (in_array(array('p', 'h'), $a)) {
echo "'ph' was foundn";

}

if (in_array(array('f', 'i'), $a)) {//in_array() 中用数组作为 needle
echo "'fi' was foundn";
}
if (in_array('o', $a)) {
echo "'o' was foundn";
}
?>

程序运行结果是：

(1)Got Irix

(2)1.13 found with strict check

(3)'ph' was found 'o' was found

$arr = array(
array('a', 'b'),
array('c', 'd')
);

in_array('a', $arr); // 此时返回的永远都是 false
deep_in_array('a', $arr); // 此时返回 true 值

function deep_in_array($value, $array) {
foreach($array as $item) {
if(!is_array($item)) {
if ($item == $value) {
return true;
} else {
continue;
}
}

if(in_array($value, $item)) {
return true;
} else if(deep_in_array($value, $item)) {
return true;
}
}
return false;
}