Question

我需要用“，”然后“：”来爆炸。很容易......

$alttitle = "35:title1,36:title2, 59:title5"
$replacetitles = explode(",",$alttitle);
for ($i = 0 ; $i < count($replacetitles) ; $i++) {
   $replacetitle[] = explode(":", $replacetitles[$i]);
}

哪个产生......

数组（[0] =＆gt;数组（[0] =＆gt; 35 [1] =＆gt; title1）[1] =＆gt;数组（[0] =＆gt; 36 [1] =＆gt; title2 ）[2] =＆gt;数组（[0] =＆gt; 59 [1] =＆gt; title5））

...但是数字35,36,59是唯一的，所以我希望这成为数组的关键？

数组（[35] =＆gt; title1 [36] =＆gt; title2 [59] =＆gt; title5）

Answer 1

只需在循环时设置：

$alttitle = "35:title1,36:title2, 59:title5"
$tmptitles = explode(",",$alttitle);

$replacetitle = array();
foreach($tmptitles as $tmptitle) {
   $tmparr = explode(":", trim($tmptitle));
   $replacetitle[intval($tmparr[0])] = trim($tmparr[1]);
}

通过上述内容，您将创建数组最少的迭代次数。

Answer 2

这是我的看法

$alttitle  = "35:title1,36:title2, 59:title5";

$entries   = preg_split( "/ *, */", $alttitle );
$flattened = array();

for ( $i = 0, $l = count( $entries ); $i < $l; $i++)
{
  list( $index, $value ) = explode( ':', $entries[$i] );
  $flattened[$index] = $value;
}

print_r( $flattened );

修改

现在进行速度测试vs explode / trim

$testData = implode( ',', array_fill( 1, 10000, "a,b, c,  d" ) );

$start = microtime( true );
$entries = explode( ",", $testData );
$ouptput = array();

for ( $i = 0, $l = count( $entries ); $i < $l; $i++ )
{
  $output[] = trim( $entries[$i] );
}
echo "explode/trim test took: ", ( microtime( true ) - $start ), ' seconds<br>';

unset( $start, $entries, $output );

$start = microtime( true );
$entries = preg_split( "/ *, */", $testData );
$ouptput = array();

for ( $i = 0, $l = count( $entries ); $i < $l; $i++ )
{
  $output[] = $entries[$i];
}
echo "preg_split test took: ", ( microtime( true ) - $start ), ' seconds<br>';

Answer 3

这是另一种但可能是过度杀伤的替代方案。

if (!preg_match_all('/([0-9]+)\s*:\s*([^,]+)/', $alttitle, $matches)) {
    //not valid   
}

$array = array_combine($matches[1], $matches[2]);
print_r($array);

Answer 4

在您的代码之后，您可以添加：

$ar = array();
for ($i = 0; $i < count($replacetitle); $i++) {
    $ar[$replacetitle[$i][0]] = $replacetitle[$i][1];
}

PHP：展平多维数组

4 个答案:

修改