Check CDATA is needed

[dominikzogg]

Hello @schmittjoh

I would like to add a check if cdata is needed.

Example with check:

<?php

$document = new \DOMDocument('1.0', 'UTF-8');
$signs = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ&<>';
$signCount = strlen($signs);
$start = microtime();
for($i=0;$i<=1000;$i++) {
    $word = '';
    for($y=0;$y<=10;$y++) {
        $word .= $signs[rand(0, $signCount - 1)];
    }
    $node = $document->createElement('entry');
    if(strpos($word, '<') !== false || strpos($word, '&') !== false) {
        $cdata = $document->createCDATASection($word);
        $node->appendChild($cdata);
    } else {
        $node->nodeValue = $word;
    }
    $document->appendChild($node);
}
echo microtime() - $start;

Example without check:

<?php

$document = new \DOMDocument('1.0', 'UTF-8');
$signs = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ&<>';
$signCount = strlen($signs);
$start = microtime();
for($i=0;$i<=1000;$i++) {
    $word = '';
    for($y=0;$y<=10;$y++) {
        $word .= $signs[rand(0, $signCount - 1)];
    }
    $node = $document->createElement('entry');
    $cdata = $document->createCDATASection($word);
    $node->appendChild($cdata);
    $document->appendChild($node);
}
echo microtime() - $start;

Time needed with check:
0.018812
0.018168
0.018789

Time needed without check:
0.01897
0.018391
0.020334
0.025101
0.018615

In worst case had it ones, it can be 40% slower, but most of time it was nearly as fast as without check. In the serializer the percentage would be much lower, cause its much more complex than my example.

[marcospassos]

The PR #119 adds this possibility.

[goetas]

implemented with #187