how to work with RegexIterator::REPLACE mode?

问题:

What is wrong in my code:

$i = new RegexIterator(   new ArrayIterator(array(     'test1'=>'test888',      'test2'=>'what?',      'test3'=>'test999')),   '/^test(.*)/',   RegexIterator::REPLACE);  foreach ($i as $name=>$value)   echo $name . '=>' . $value . "\n"; 

The iterator is empty, why? Thanks for your help!

回答1:

If you ommit the operation mode (3rd parameter in your new RegexIterator statement) you'll get the matching values, like so:

$array = array('test1' => 'test888', 'test2' => 'what?', 'test3' => 'test999'); $pattern = '/^test(.*)/';  echo '<pre>'; echo "DEFAULT\n"; $arrayIterator = new ArrayIterator($array); $regexIterator = new RegexIterator($arrayIterator, $pattern); foreach ($regexIterator as $value) {echo "$value\n";} echo '</pre>'; 

You can play with the different operation modes, depending on what you want. Go read up on the setMode documentation: http://www.php.net/manual/en/regexiterator.setmode.php

回答2:

As said already, it's a bug in PHP. I reported it to php.net: http://bugs.php.net/bug.php?id=50579

回答3:

Consider the following code

$mixedArray=array(     'tester2',     'tes1',     'bad4',     '2good2',     '2birds',     'birds8',     '8young girls',     '6 young boys' );   $ait=new ArrayIterator($mixedArray); $regexIt=new RegexIterator($ait,'/^(\d+)(\w+)/', RegexIterator::REPLACE); $regexIt->replacement='$2:$1';  foreach($regexIt as $key=>$value){     echo $value."<br>"; } 

Output

good2:2 birds:2 young:8 girls 

文章来源: how to work with RegexIterator::REPLACE mode?