PHP函数(2)

in_array(value,array,type)        //检查一个值是否在数组中,type可选,设置为true检查类型是否相同,分大小写
例:
$os = array("Mac", "NT", "Irix", "Linux");
if (in_array("Irix", $os)) {
echo "Got Irix";
}
if (in_array("mac", $os)) {
echo "Got mac";
}

第二个条件失败，因为 in_array() 是区分大小写的，所以以上程序显示为:
Got Irix

in_array() 严格类型检查例子
$a = array('1.10', 12.4, 1.13);
if (in_array('12.4', $a, true)) {
echo "'12.4' found with strict check\n";
}
if (in_array(1.13, $a, true)) {
echo "1.13 found with strict check\n";
}

上例将输出：
1.13 found with strict check

in_array() 中用数组作为 needle
$a = array(array('p', 'h'), array('p', 'r'), 'o');
if (in_array(array('p', 'h'), $a)) {
echo "'ph' was found\n";
}
if (in_array(array('f', 'i'), $a)) {
echo "'fi' was found\n";
}
if (in_array('o', $a)) {
echo "'o' was found\n";
}
上例将输出：
'ph' was found
'o' was found