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@ 2015-11-14T22:31:38Z

<?php

function applyHLToSiblings(DOMDocument $D){

    $words[0] = "cart";
    /*
    $words[1] = "car";
    $words[2] = "cartel";
    $words[3] = "art";
    $words[4] = "drug";
    $words[5] = "drugs";
    $words[6] = "rug";
    $words[7] = "rugs";
    */
    
    $mt = function($content) use($D){
        return $D->createTextNode($content);
    };
    
    $ms = function($content = null, $name) use($D){
        $span = $D->createElement("span");
        $span->setAttribute("class", "word$name");
        $content === null ?: $span->appendChild($content);
        return $span;
    };
    
    $ps = function($siblingsContainer, $searchString, $name) use($D, $ms, $mt){
        foreach($siblingsContainer->childNodes as $node){
            if($node instanceof DOMText){
                if(mb_strlen($node->textContent, "UTF-8") >= mb_strlen($searchString)){
                    $o = mb_strpos($node->textContent, $searchString);
                    if($o !== false){
                        $l = mb_strlen($searchString, "UTF-8");
                        $before = mb_substr($node->textContent, 0, $o);
                        $wrap = mb_substr($node->textContent, $o, $l);
                        $after = mb_substr($node->textContent, $o + $l);

                        $after  ? $node->parentNode->insertBefore($mt($after)             , $node->nextSibling) : null;
                                  $node->parentNode->insertBefore($ms($mt($wrap), $name)  , $node->nextSibling);
                        $before ? $node->parentNode->insertBefore($mt($before)            , $node->nextSibling) : null;
                        
                        $node->parentNode->removeChild($node);
                    }
                }
            }
        }
    };
    
    foreach($words as $name => $word)
        $ps($D->documentElement, $word, $name);
        
    
}


$x = new DOMDocument();
$x->loadXML("<data>drugs cartel</data>");
applyHLToSiblings($x);
var_dump($x->saveXML());

Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: Deprecated: Optional parameter $content declared before required parameter $name is implicitly treated as a required parameter in /in/OOE7Q on line 20 string(75) "<?xml version="1.0"?> <data>drugs <span class="word0">cart</span>el</data> "
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Deprecated: Optional parameter $content declared before required parameter $name is implicitly treated as a required parameter in /in/OOE7Q on line 20 string(75) "<?xml version="1.0"?> <data>drugs <span class="word0">cart</span>el</data> "
Output for 8.0.0 - 8.0.30: Deprecated: Required parameter $name follows optional parameter $content in /in/OOE7Q on line 20 string(75) "<?xml version="1.0"?> <data>drugs <span class="word0">cart</span>el</data> "
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33: string(75) "<?xml version="1.0"?> <data>drugs <span class="word0">cart</span>el</data> "

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