SAX 解析器用于解析 xml 文件，并且比示例 xml 解析器和 DOM 更适合内存管理。它不会在内存中保留任何数据，因此可以用于非常大的文件。以下示例将展示如何使用 SAX API 从 xml 获取数据。
SAX.xml
XML 应如下所示 –
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<?xml version = "1.0" encoding = "utf-8"?> <tutors> <course> <name>Android</name> <country>India</country> <email>contact@tutorialspoint.com</email> <phone>123456789</phone> </course> <course> <name>Java</name> <country>India</country> <email>contact@tutorialspoint.com</email> <phone>123456789</phone> </course> <course> <name>HTML</name> <country>India</country> <email>contact@tutorialspoint.com</email> <phone>123456789</phone> </course> </tutors> |
SAX.php
PHP 文件应如下 –
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<?php //Reading XML using the SAX(Simple API for XML) parser $tutors = array(); $elements = null; // Called to this function when tags are opened function startElements($parser, $name, $attrs) { global $tutors, $elements; if(!empty($name)) { if ($name == 'COURSE') { // creating an array to store information $tutors []= array(); } $elements = $name; } } // Called to this function when tags are closed function endElements($parser, $name) { global $elements; if(!empty($name)) { $elements = null; } } // Called on the text between the start and end of the tags function characterData($parser, $data) { global $tutors, $elements; if(!empty($data)) { if ($elements == 'NAME' || $elements == 'COUNTRY' || $elements == 'EMAIL' || $elements == 'PHONE') { $tutors[count($tutors)-1][$elements] = trim($data); } } } // Creates a new XML parser and returns a resource handle referencing it to be used by the other XML functions. $parser = xml_parser_create(); xml_set_element_handler($parser, "startElements", "endElements"); xml_set_character_data_handler($parser, "characterData"); // open xml file if (!($handle = fopen('sax.xml', "r"))) { die("could not open XML input"); } while($data = fread($handle, 4096)) // read xml file { xml_parse($parser, $data); // start parsing an xml document } xml_parser_free($parser); // deletes the parser $i = 1; foreach($tutors as $course) { echo "course No - ".$i.'<br/>'; echo "course Name - ".$course['NAME'].'<br/>'; echo "Country - ".$course['COUNTRY'].'<br/>'; echo "Email - ".$course['EMAIL'].'<br/>'; echo "Phone - ".$course['PHONE'].'<hr/>'; $i++; } ?> |
它将产生以下结果 –
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