在php中简单数据搜索很简单我们直接使用in_array() 函数在数组中搜索给定的值即可,这种是简单的一维数据,例如下代码:

2. $people = array("Peter", "Joe", "Glenn", "Cleveland");
3. if (in_array("Glenn",$people))
4. {
5. echo "Match found";
6. }
7. else
8. {
9. echo "Match not found";
10. }
11. ?>

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:

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：apple's color is red

array_search()函数,代码如下:

1. $fruits["apple"] = "red";
2. $fruits["banana"] = "yellow";
3. $fruits["watermelon"]="green";
4. $founded = array_search("green", $fruits);
5. if($founded)
6. printf("%s was founded on %s.",$founded, $fruits[$founded])

array_keys()函数,代码如下:

1. $fruits["apple"] = "red";
2. $fruits["banana"] = "yellow";
3. $fruits["watermelon"]="green";
4. $keys = array_keys($fruits);
5. 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,php搜索多维数组的键值,如下面例子:

1. $foo[1]['a']['xx'] = 'bar 1';
2. $foo[1]['b']['xx'] = 'bar 2';
3. $foo[2]['a']['bb'] = 'bar 3';
4. $foo[2]['a']['yy'] = 'bar 4';
5. $foo[3]['c']['dd'] = 'bar 3';
6. $foo[3]['f']['gg'] = 'bar 3';
7. $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：

1. function array_search_re($needle, $haystack, $a=0, $nodes_temp=array()){
2. global $nodes_found;
3. $a++;
4. foreach ($haystack as $key1=>$value1) {
5. $nodes_temp[$a] = $key1;
6. if (is_array($value1)){
7. array_search_re($needle, $value1, $a, $nodes_temp);
8. }
9. else if ($value1 === $needle){
10. $nodes_found[] = $nodes_temp;
11. }
12. }
13. return $nodes_found;
14. }

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,代码如下:

1. $result = array_search_re('bar 3', $foo);
2. print_r($result);
3. //输出结果为如下：
4. Array ( [0] => Array ( [1] => 2 [2] => a [3] => bb )
5. [1] => Array ( [1] => 3 [2] => c [3] => dd )
6. [2] => Array ( [1] => 3 [2] => f [3] => gg )
7. )

php搜索多维数组的键名,代码如下:

1. function array_search_key($needle, $haystack){
2. global $nodes_found;
3. foreach ($haystack as $key1=>$value1) {
5. if ($key1=== $needle){
7. $nodes_found[] = $value1;
9. }
10. if (is_array($value1)){
11. array_search_key($needle, $value1);
12. }
15. }
16. return $nodes_found;
17. }
18. $result = array_search_key('a', $foo);
19. print_r($result);

输出结果为如下：

1. Array
2. (
3. [0] => Array
4. (
5. [xx] => bar 1
6. )
7. [1] => Array
8. (
9. [bb] => bar 3
10. )
11. [2] => Array
12. (
13. [yy] => bar 4
14. )
15. )

通过遍历我们可以实现多维数据搜索了.