php中数组的搜索程序代码

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:

  1. <?php
  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) {
  4. if ($key1=== $needle){
  5. $nodes_found[] = $value1;
  6. }
  7. if (is_array($value1)){
  8. array_search_key($needle, $value1);
  9. }
  10. }
  11. return $nodes_found;
  12. }
  13. $result = array_search_key('a', $foo);
  14. print_r($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.