class-open-external-links-in-new-tab.php — Admin and Site Enhancements (ASE) 7.5.2

admin-site-enhancements / classes / class-open-external-links-in-new-tab.php

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class-open-external-links-in-new-tab.php

78 lines

1	<?php
2
3	namespace ASENHA\Classes;
4
5	/**
6	* Class for Open All External Links in New Tab module
7	*
8	* @since 6.9.5
9	*/
10	class Open_External_Links_In_New_Tab {
11
12	/**
13	* Parse links in content to add target="_blank" rel="noopener noreferrer nofollow" attributes
14	*
15	* @since 4.9.0
16	*/
17	public function add_target_and_rel_atts_to_content_links( $content ) {
18	if ( ! empty( $content ) ) {
19
20	// regex pattern for "a href"
21	$regexp = "<a\s[^>]href=(\"??)([^\" >]?)\\1[^>]*>";
22
23	if ( preg_match_all( "/$regexp/siU", $content, $matches, PREG_SET_ORDER ) ) {
24
25	// $matches might contain parts of $content that has links (a href)
26	preg_match_all( "/$regexp/siU", $content, $matches, PREG_SET_ORDER );
27
28	if ( is_array( $matches ) ) {
29	$i = 0;
30
31	foreach ( $matches as $match ) {
32
33	$original_tag = $match[0]; // e.g. <a title="Link Title" href="http://www.example.com/sit-quaerat">
34	$tag = $match[0]; // Same value as $original_tag but for further processing
35	$url = $match[2]; // e.g. http://www.example.com/sit-quaerat
36
37	if ( false !== strpos( $url, get_site_url() ) ) {
38	// Internal link. Do nothing.
39	} elseif ( false === strpos( $url, 'http' ) ) {
40	// Relative link to internal URL. Do nothing.
41	} else {
42	// External link. Let's do something.
43	// Regex pattern for target="_blank\|parent\|self\|top"
44	$pattern = '/target\s=\s"\s_(blank\|parent\|self\|top)\s"/';
45	// If there's no 'target="_blank\|parent\|self\|top"' in $tag, add target="blank"
46	if ( 0 === preg_match( $pattern, $tag ) ) {
47	// Replace closing > with ' target="_blank">'
48	$tag = substr_replace( $tag, ' target="_blank">', -1 );
49	}
50
51	// If there's no 'rel' attribute in $tag, add rel="noopener noreferrer nofollow"
52	$pattern = '/rel\s=\s\"[a-zA-Z0-9_\s]*\"/';
53	if ( 0 === preg_match( $pattern, $tag ) ) {
54	// Replace closing > with ' rel="noopener noreferrer nofollow">'
55	$tag = substr_replace( $tag, ' rel="noopener noreferrer nofollow">', -1 );
56	} else {
57	// replace rel="noopener" with rel="noopener noreferrer nofollow"
58	if ( false !== strpos( $tag, 'noopener' )
59	&& false === strpos( $tag, 'noreferrer' )
60	&& false === strpos( $tag, 'nofollow' )
61	) {
62	$tag = str_replace( 'noopener', 'noopener noreferrer nofollow', $tag );
63	}
64	}
65
66	// Replace original a href tag with one containing target and rel attributes above
67	$content = str_replace( $original_tag, $tag, $content );
68	}
69	$i++;
70	}
71	}
72	}
73	}
74
75	return $content;
76	}
77
78	}