php in_array函数用法（实例）

bool in_array(mixed $needle, array $haystack[, bool $strict = FALSE])

<?php
$sites = array("Google", "phpcn", "Taobao", "Facebook"); 
if (in_array("phpcn", $sites)){
    echo "找到匹配项！";
}else{
    echo "没有找到匹配项！";
}
?>

找到匹配项！

<?php
$people = array("Bill", "Steve", "Mark", "David");

if (in_array("23", $people, TRUE))
  {
  echo "匹配已找到<br>";
  }
else
  {
  echo "匹配未找到<br>";
  }
if (in_array("Mark",$people, TRUE))
  {
  echo "匹配已找到<br>";
  }
else
  {
  echo "匹配未找到<br>";
  }

if (in_array(23,$people, TRUE))
  {
  echo "匹配已找到<br>";
  }
else
  {
  echo "匹配未找到<br>";
  }
?>

匹配未找到
匹配已找到
匹配未找到