PHP数组键函数包含所述值

Question

我正在搜索数组中的特定值，我想知道我是否可以搜索以查看该值包含我搜索的内容，而不一定是完全匹配

所以..

$a = array("red", "reddish", "re", "red diamond");

这只会给我一把钥匙

$red = array_keys($a, "red");

如果我想要包含单词red的所有键，该怎么办？所以我想＆＃34; red＆＃34;，＆＃34; reddish＆＃34;和＆＃34;红钻＆＃34;

或者说我想要0, 1, 3

Answer 1

使用preg_grep：

$a = array("red", "reddish", "re", "red diamond");
$red = array_keys(preg_grep("/red/", $a));
print_r($red);

DEMO

上面的代码为您提供了$a中包含字符串"red"的所有值的键。如果您需要$a中以字符串"red"开头的所有值的键，只需将正则表达式从"/red/"更改为"/^red/"即可。

Answer 2

你可以这样做＆gt;的 Live Demonstration

专门搜索Red

// Create a function to filter anything 'red'
function red($var) {
  if(strpos($var, 'red') === false) {
      // If array item does not contain red, filter it out by returning false
      return false;
  } else {
      // If array item contains 'red', then keep the item
      return $var;
  }

}


// Set the array (as per your question)
$array = array("red", "reddish", "re", "red diamond");

// This line executes the function red() passing the array to it.    
$newarray = array_filter($array, 'red');

// Dump the results
var_export(  array_keys($newarray) );

使用array_filter()或array_map()可让开发人员更好地控制数组中的快速循环，以过滤和执行其他代码。上述功能旨在满足您的要求，但它可能会像您想要的那样复杂。

如果您想设置值＆＃39; red＆＃39;在它内部更具动态性，你可以做类似以下的事情：

通用搜索方法

// Set the array (as per your question)
$array = array("red", "reddish", "re", "red diamond");

// Set the text you want to filter for    
$color_filter = 'red';

// This line executes the function red() passing the array to it.    
$newarray = array_filter($array, 'dofilter');

// Dump the results
var_export(  array_keys($newarray) );


// Create a function to filter anything 'red'
function dofilter($var) {
  global $color_filter;
  if(strpos($var, $color_filter) === false) {
      // If array item does not contain $color_filter (value), filter it out by returning false
      return false;
  } else {
      // If array item contains $color_filter (value), then keep the item
      return $var;
  }

}

Answer 3

$a = array("red", "reddish", "re", "red diamond");

function find_matches( $search, $array )
{
    $keys = array();
    foreach( $array as  $key => $val )
    {
        if( strpos( $val, $search ) !== false )
            $keys[] = $key;
    }
    return $keys;
}