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
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$people = array("Peter", "Joe", "Glenn", "Cleveland");
if (in_array("Glenn",$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";
}
?>
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$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
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Output:
Match found
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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);
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$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.
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The following example will search for apple in the array key, and if found, will output the color of the fruit:
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$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
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$fruits["apple"] = "red";
$fruits["banana"] = "yellow";
$fruits["watermelon"]="green";
$keys = array_keys($fruits);
print_r($keys);
//Array ( [0] => apple [1] => banana [2] => watermelon )
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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 $fruits for a specific date (December 7), and if found, returns information about the corresponding state:
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$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 $fruit array:
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$fruits["apple"] = "red";
$fruits["banana"] = "yellow";
$fruits["watermelon"]="green";
$keys = array_keys($fruits);
print_r($keys);
//Array ( [0] => apple [1] => banana [2] => watermelon )
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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 $fruits:
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$fruits["apple"] = "red";
$fruits["banana"] = "yellow";
$fruits["watermelon"]="green";
$values = array_values($fruits);
print_r($values);
//Array ( [0] => red [1] => yellow [2] => green )
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$fruits["apple"] = "red";
$fruits["banana"] = "yellow";
$fruits["watermelon"]="green";
$values = array_values($fruits);
print_r($values);
//Array ( [0] => red [1] => yellow [2] => green )
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What is mentioned above is only one-dimensional array search. If we want to implement two-dimensional data or multi-dimensional data, we can refer to the following example
1 php search key value of multi-dimensional array
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$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 )
)
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As an example below:
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$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 )
)
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php搜索多维数组的键名
代码如下
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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
)
)
|
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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。...
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