{"id":36,"date":"2008-08-31T19:54:14","date_gmt":"2008-08-31T23:54:14","guid":{"rendered":"http:\/\/www.compdigitec.com\/labs\/?p=36"},"modified":"2008-08-31T19:54:14","modified_gmt":"2008-08-31T23:54:14","slug":"domnodelist-as-an-array","status":"publish","type":"post","link":"http:\/\/www.compdigitec.com\/labs\/2008\/08\/31\/domnodelist-as-an-array\/","title":{"rendered":"DOMNodeList as an Array"},"content":{"rendered":"

When using getElementsByTagName, it returns a DOMNodeList<\/a> which you can use with foreach<\/a>, but you can’t use array indexes to access elements.<\/p>\n

For example, you can use the following code to the contents of the first “test” tag:
\n
\n<?php
\n$file <\/span>= <\/span>'z.xml'<\/span>;
\n<\/span>$xmlfile <\/span>=\u00a0new <\/span>DOMDocument<\/span>();
\n@<\/span>$xmlfile<\/span>-><\/span>load<\/span>(<\/span>$file<\/span>);
\n<\/span>$iplist <\/span>= <\/span>$xmlfile<\/span>-><\/span>getElementsByTagName<\/span>(<\/span>'test'<\/span>);
\n<\/span>$i <\/span>= <\/span>0<\/span>;
\nforeach(<\/span>$iplist <\/span>as <\/span>$v<\/span>)\u00a0{
\nif(<\/span>$i <\/span>== <\/span>0<\/span>)\u00a0{
\n<\/span>var_dump<\/span>(<\/span>$v<\/span>-><\/span>nodeValue<\/span>);
\n}
\n<\/span>$i<\/span>++;
\n}
\n<\/span>?><\/span><\/span><\/code><\/p>\n

Use this as z.xml:
\n<?xml version=\"1.0\" ?><test>Testing: hello, world<\/test><\/code><\/p>\n

So as you can see, the $iplist variable is acting like an array<\/a> (via foreach behaviour). But try this code:
\n
\n<?php
\n$file <\/span>= <\/span>'z.xml'<\/span>;
\n<\/span>$xmlfile <\/span>=\u00a0new <\/span>DOMDocument<\/span>();
\n@<\/span>$xmlfile<\/span>-><\/span>load<\/span>(<\/span>$file<\/span>);
\n<\/span>$iplist <\/span>= <\/span>$xmlfile<\/span>-><\/span>getElementsByTagName<\/span>(<\/span>'test'<\/span>);
\n<\/span>var_dump<\/span>(<\/span>$iplist<\/span>[<\/span>0<\/span>]-><\/span>nodeValue<\/span>);
\n<\/span>?><\/span><\/span><\/code><\/p>\n

The error “Fatal error: Cannot use object of type DOMNodeList as array in <\/strong>\/usr\/dev\/php5\/error.php<\/em> on line 6<\/strong>” should occur. To fix this, use $iplist->item(0) instead of $iplist[0], though you can still use DOMNodeList with foreach. The following code should work:
\n
\n<?php
\n$file <\/span>= <\/span>'z.xml'<\/span>;
\n<\/span>$xmlfile <\/span>=\u00a0new <\/span>DOMDocument<\/span>();
\n@<\/span>$xmlfile<\/span>-><\/span>load<\/span>(<\/span>$file<\/span>);
\n<\/span>$iplist <\/span>= <\/span>$xmlfile<\/span>-><\/span>getElementsByTagName<\/span>(<\/span>'test'<\/span>);
\n<\/span>var_dump<\/span>(<\/span>$iplist<\/span>-><\/span>item<\/span>(<\/span>0<\/span>)-><\/span>nodeValue<\/span>);
\n<\/span>?><\/span><\/span><\/code><\/p>\n

If you found this article helpful or useful, please help Compdigitec by spreading the word or by leaving a comment. Don’t forget to subscribe<\/a> to Compdigitec Labs for more interesting articles!<\/p>","protected":false},"excerpt":{"rendered":"

When using getElementsByTagName, it returns a DOMNodeList which you can use with foreach, but you can’t use array indexes to access elements. For example, you can use the following code to the contents of the first “test” tag: <?php $file = ‘z.xml’; $xmlfile =\u00a0new DOMDocument(); @$xmlfile->load($file); $iplist = $xmlfile->getElementsByTagName(‘test’); $i = 0; foreach($iplist as $v)\u00a0{ […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[5],"tags":[173,172,174,176,175,177],"_links":{"self":[{"href":"http:\/\/www.compdigitec.com\/labs\/wp-json\/wp\/v2\/posts\/36"}],"collection":[{"href":"http:\/\/www.compdigitec.com\/labs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.compdigitec.com\/labs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.compdigitec.com\/labs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.compdigitec.com\/labs\/wp-json\/wp\/v2\/comments?post=36"}],"version-history":[{"count":0,"href":"http:\/\/www.compdigitec.com\/labs\/wp-json\/wp\/v2\/posts\/36\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.compdigitec.com\/labs\/wp-json\/wp\/v2\/media?parent=36"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.compdigitec.com\/labs\/wp-json\/wp\/v2\/categories?post=36"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.compdigitec.com\/labs\/wp-json\/wp\/v2\/tags?post=36"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}