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January 23, 2021 04:02
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Get a substring from an HTML string that includes HTML tags. Tags that are interrupted in the tag are removed, all others are auto-closed if necessary
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| <?php | |
| // $start is option, but it will trim the HTML. Recommended to keep at 0 and use for start of strings only. | |
| function substr_html( string $str, int $start = 0, int $end, array $replace_tags = array(), string $encoding = 'utf-8', bool $remove_body = true ){ | |
| $max = strlen($str); | |
| $out = $last_caret = ''; | |
| for( $i = $characters = $gt = 0, $lt = -1; $characters < $end && $i < $max; $i++ ){ | |
| $char = $str[$i]; | |
| $entity = false; | |
| if( $gt > $lt && $last_caret == '>' ){ | |
| if( ($char == '<' && !preg_match('/[a-zA-Z\/!]/',$str[$i+1])) || $char == '>' ){ | |
| $entity = true; $characters++; | |
| } | |
| if( !$entity ) $characters++; | |
| } | |
| if( !$entity ){ | |
| switch( $char ){ | |
| case '<': $last_caret = '<'; $lt = $i; break; | |
| case '>': $last_caret = '>'; $gt = $i; $characters--; break; | |
| } | |
| } | |
| if( $characters < $end ) | |
| $out .= ($entity) ? htmlentities($char) : $char; | |
| if( ($characters == $end || $i == $max) ) | |
| $out .= '…'; | |
| } | |
| $dom = new \DOMDocument(); | |
| $dom->loadHTML( "<?xml encoding=\"{$encoding}\" ?>" . $out, LIBXML_HTML_NODEFDTD ); | |
| $path = new \DOMXPath( $dom ); | |
| $body = $path->query( '/html/body' ); | |
| $html = $dom->saveHTML( $body->item(0) ); | |
| if( !empty( $replace_tags ) ){ | |
| foreach( $replace_tags as $replace => $with ){ | |
| $html = preg_replace( "/<(\/{0,1})$replace>/i", "<$1$with>", $html ); | |
| } | |
| } | |
| if( $remove_body ) | |
| $html = str_ireplace( array('<body>','</body>'), '', $html ); | |
| return $html; | |
| } | |
| ?> |
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Added exclamation into the caret check to allow for HTML comments to be skipped as well, since they're effectively ignorable and irrelevant to the character limit