PHP array search (multidimensional array search)_PHP tutorial

There are many ways to implement array search in php. I know that the simplest one is in_array and traversing the array and then comparing them one by one. There are other better methods. I will introduce them below.

One-dimensional array search is simple in_array()

If the value parameter is a string and the type parameter is set to true, the search is case sensitive

The code is as follows

Copy code

代码如下	复制代码
$people = array("Peter", "Joe", "Glenn", "Cleveland"); if (in_array("Glenn",$people)) { echo "Match found"; } else { echo "Match not found"; } ?> 输出： Match found

$people = array("Peter", "Joe", "Glenn", "Cleveland");
if (in_array("Glenn",$people)) {

echo "Match found";

}

else

{

echo "Match not found";

}

?>

代码如下	复制代码
$fruit["apple"] = "red"; $fruit["banana"] = "yellow"; $fruit["pear"] = "green"; if(array_key_exists("apple", $fruit)){  printf("apple's color is %s",$fruit["apple"]); } //apple's color is red

Output:

Match found

array_key_exists() function

If a specified key is found in an array, the function array_key_exists() returns true, otherwise it returns false. Its form is as follows:

boolean array_key_exists(mixed key,array array);

代码如下	复制代码
$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]); //watermelon was founded on green.

The following example will search for apple in the array key, and if found, will output the color of the fruit:

The code is as follows	Copy code
$fruit["apple"] = "red"; $fruit["banana"] = "yellow"; $fruit["pear"] = "green"; if(array_key_exists("apple", $fruit)){ printf("apple's color is %s",$fruit["apple"]); } //apple's color is red

代码如下	复制代码
$fruits["apple"] = "red"; $fruits["banana"] = "yellow"; $fruits["watermelon"]="green"; $keys = array_keys($fruits); print_r($keys); //Array ( [0] => apple [1] => banana [2] => watermelon )

array_search() function The array_search() function searches for a specified value in an array and returns the corresponding key if found, otherwise it returns false. Its form is as follows: mixed array_search(mixed needle,array haystack[,boolean strict]) The following example searches $fruits for a specific date (December 7), and if found, returns information about the corresponding state:

The code is as follows	Copy code
$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]); //watermelon was founded on green.

array_keys() function The array_keys() function returns an array containing all keys found in the searched array. Its form is as follows: array array_keys(array array[,mixed search_value]) If the optional parameter search_value is included, only keys matching that value will be returned. The following example will output all arrays found in the $fruit array:

The code is as follows	Copy code
$fruits["apple"] = "red"; $fruits["banana"] = "yellow"; $fruits["watermelon"]="green"; $keys = array_keys($fruits); print_r($keys); //Array ( [0] => apple [1] => banana [2] => watermelon )

array_values() function

The array_values() function returns all the values ​​in an array and automatically provides a numerical index for the returned array. Its form is as follows:

array array_values(array array)

The following example will get the value of each element found in $fruits:

The code is as follows

Copy code

代码如下	复制代码
$fruits["apple"] = "red"; $fruits["banana"] = "yellow"; $fruits["watermelon"]="green"; $values = array_values($fruits); print_r($values); //Array ( [0] => red [1] => yellow [2] => green )

$fruits["apple"] = "red";
$fruits["banana"] = "yellow";
$fruits["watermelon"]="green";
$values ​​= array_values($fruits);
print_r($values);

//Array ( [0] => red [1] => yellow [2] => green )

What is mentioned above is only one-dimensional array search. If we want to implement two-dimensional data or multi-dimensional data, we can refer to the following example

1 php search key value of multi-dimensional array

代码如下

复制代码

$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'; $foo['info'][1] = 'bar 5'; 如果要查找 bar 3 怎么进行查找呢。有三个结果，而这三个结果都要，看下面的函数： ------------------------------------------------------------------------------------------------------------------------------- function array_search_re($needle, $haystack, $a=0, $nodes_temp=array()){ 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 )         )

As an example below:

The code is as follows

Copy code

$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'; $foo['info'][1] = 'bar 5'; If you want to find bar 3, how to search it? There are three results, and all three results are required. Look at the following function: -------------------------------------------------- -------------------------------------------------- ---------------------------- function array_search_re($needle, $haystack, $a=0, $nodes_temp=array()){ 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; } -------------------------------------------------- -------------------------------------------------- -------------------------- This function can return all the key names found above $result = array_search_re('bar 3', $foo); print_r($result); The output results are as follows: Array ( [0] => Array ( [1] => 2 [2] => a [3] => bb )                                                                                                                                                                                                                          )

php搜索多维数组的键名

 代码如下

代码如下

复制代码

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         ) )

复制代码

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
        )

)

http://www.bkjia.com/PHPjc/633084.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/633084.htmlTechArticle在php中要实现数组搜索方法有很多种，我知道最简单的就是in_array与遍历数组后再一个个对比，其它还有更多更好方法，下面我来介绍介绍。...