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:
<?php $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:
<?php $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:
<?php $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'; $foo['info'][1] = 'bar 5';
如果要查找 bar 3 怎么进行查找呢,有三个结果,而这三个结果都要,看下面的函数:
<?php function array_search_re($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:
<?php $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:
<?php 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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