【www.bbyears.com--php常用代码】
例
代码如下$people = array("Peter", "Joe", "Glenn", "Cleveland");
if (in_array("Glenn",$people))
{
echo "Match found";
}
else
{
echo "Match not found";
}
?>
输出：
Match found。
array_key_exists()函数
如果在一个数组中找到一个指定的键，函数array_key_exists()返回true，否则返回false。其形式如下：
1 boolean array_key_exists(mixed key,array array);
下面的例子将在数组键中搜索apple，如果找到，将输出这个水果的颜色：
代码如下
1 $fruit["apple"] = "red";
2 $fruit["banana"] = "yellow";
3 $fruit["pear"] = "green";
4 if(array_key_exists("apple", $fruit)){
5 printf("apple"s color is %s",$fruit["apple"]);
6 }
执行这段代码得到的结果：
1 apple"s color is red
array_search()函数
$fruits["apple"] = "red";
$fruits["banana"] = "yellow";
$fruits["watermelon"]="green";
$founded = array_search("green", $fruits);
if($founded)
printf("%s was founded on %s.",$founded, $fruits[$founded])
array_keys()函数
代码如下$fruits["apple"] = "red";
$fruits["banana"] = "yellow";
$fruits["watermelon"]="green";
$keys = array_keys($fruits);
print_r($keys);
上面的方法都只能搜索一维数据，如果是多维数据就没办法了。
1 php搜索多维数组的键值
如下面例子:
代码如下$foo[1]["a"]["xx"] = "bar 1";
$foo[1]["b"]["xx"] = "bar 2";
$foo[2]["a"]["bb"] = "bar 3";
$foo[2]["a"]["yy"] = "bar 4";
$foo[3]["c"]["dd"] = "bar 3";
$foo[3]["f"]["gg"] = "bar 3";
$foo["info"][1] = "bar 5";
如果要查找 bar 3 怎么进行查找呢。有三个结果，而这三个结果都要，看下面的函数：
-------------------------------------------------------------------------------------------------------------------------------
global $nodes_found;
$a++;
foreach ($haystack as $key1=>$value1) {
$nodes_temp[$a] = $key1;
if (is_array($value1)){
array_search_re($needle, $value1, $a, $nodes_temp);
}
else if ($value1 === $needle){
$nodes_found[] = $nodes_temp;
}
}
return $nodes_found;
}
---------------------------------------------------------------------------------------------------------------------------------
这个函数就可以把上面要查找到的内容全部返回出键名来
$result = array_search_re("bar 3", $foo);
print_r($result);
输出结果为如下：
Array ( [0] => Array ( [1] => 2 [2] => a [3] => bb )
[1] => Array ( [1] => 3 [2] => c [3] => dd )
[2] => Array ( [1] => 3 [2] => f [3] => gg )
)
1 php搜索多维数组的键名
代码如下function array_search_key($needle, $haystack){
global $nodes_found;
foreach ($haystack as $key1=>$value1) {
if ($key1=== $needle){
$nodes_found[] = $value1;
}
if (is_array($value1)){
array_search_key($needle, $value1);
}
}
return $nodes_found;
}
$result = array_search_key("a", $foo);
print_r($result);
输出结果为如下：
Array
(
[0] => Array
(
[xx] => bar 1
)
[1] => Array
(
[bb] => bar 3
)
[2] => Array
(
[yy] => bar 4
)
)
通过遍历我们可以实现多维数据搜索了。