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
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$people = array("Peter", "Joe", "Glenn", "Cleveland"); if (in_array("Glenn",$people))
{
echo "Match found";
}
else
{
echo "Match not found";
}
?> |
$people = array("Peter", "Joe", "Glenn", "Cleveland");if (in_array("Glenn",$people)) { echo "Match found";
} else {
echo "Match not found"; }?> |
输出：
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|
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 }
|
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：
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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]) |
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$fruits["apple"] = "red";
$fruits["banana"] = "yellow";
$fruits["watermelon"]="green";
$keys = array_keys($fruits);
print_r($keys); |
1 $fruit["apple"] = "red"; 2 $fruit["banana"] = "yellow";
3 $fruit["pear"] = "green";
4 if(array_key_exists("apple", $fruit)){
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$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';
$foo['info'][1] = 'bar 5'; |
5 printf("apple's color is %s",$fruit["apple"]); 6 } |
执行这段代码得到的结果：1 apple's color is redarray_search()函数
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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]) |
array_keys()函数
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| $fruits["apple"] = "red";$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:
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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';$foo['info'][1] = 'bar 5'; |
如果要查找 bar 3 怎么进行查找呢。有三个结果，而这三个结果都要，看下面的函数：
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代码如下
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function array_search_re($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 $nodes_found;
}
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function array_search_re($needle, $haystack, $a=0, $nodes_temp=array()){global $nodes_found;
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|
$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 )
)
|
$a ;foreach ($haystack as $key1=>$value1) { $nodes_temp[$a] = $key1;
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|
function array_search_key($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
)
)
|
if (is_array($value1)){ array_search_re($needle, $value1, $a, $nodes_temp); } else if ($value1 === $needle){
| $nodes_found[] = $nodes_temp;
}
}
return $nodes_found;
}
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这个函数就可以把上面要查找到的内容全部返回出键名来
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$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
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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 ))
通过遍历我们可以实现多维数据搜索了。
教程链接:随意转载~但请保留教程地址★ |
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