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:
<?php $people = array ( "Peter" , "Joe" , "Glenn" , "Cleveland" ); if (in_array( "Glenn" , $people )) { echo "Match found" ; } else { echo "Match not found" ; } ?>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:
$fruit [ "apple" ] = "red" ; $fruit [ "banana" ] = "yellow" ; $fruit [ "pear" ] = "green" ; if ( array_key_exists ( "apple" , $fruit )){ printf( "apple's color is %s" , $fruit [ "apple" ]); }执行这段代码得到的结果：apple's color is red
array_search()函数, 代码如下:
$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, 代码如下:
$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,php搜索多维数组的键值,如下面例子:
$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,代码如下:
$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 ) )php搜索多维数组的键名, 代码如下:
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.
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