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preg_replace_callback函數(shù)如何在php中使用?很多新手對此不是很清楚,為了幫助大家解決這個難題,下面小編將為大家詳細(xì)講解,有這方面需求的人可以來學(xué)習(xí)下,希望你能有所收獲。
php正則表達(dá)式功能強(qiáng)大,本范例演示了preg_replace_callback函數(shù)的用法
// Define a dummy text, for testing... $Text = "Title: Hello world!\n"; $Text .= "Author: Jonas\n"; $Text .= "This is a example message!\n\n"; $Text .= "Title: Entry 2\n"; $Text .= "Author: Sonja\n"; $Text .= "Hello world, what's up!\n"; // This function will replace specific matches // into a new form function RewriteText($Match){ // Entire matched section: // --> /.../ $EntireSection = $Match[0]; // --> "\nTitle: Hello world!" // Key // --> ([a-z0-9]+) $Key = $Match[1]; // --> "Title" // Value // --> ([^\n\r]+) $Value = $Match[2]; // --> "Hello world!" // Add some bold () tags to around the key to return '' . $Key . ': ' . $Value; } // The regular expression will extract and pass all "key: value" pairs to // the "RewriteText" function that is definied above $NewText = preg_replace_callback('/[\r\n]([a-z0-9]+): ([^\n\r]+)/i', "RewriteText", $Text); // Print the new modified text print $NewText;
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