使用libxml根据schema验证xml的合法性

<?php
/*
Author: fuliang http://fuliang.iteye.com
*/
class XMLValidation{
	private $xml_path;
	private $schema_path;

	public function __construct($xml_path,$schema_path){
		$this->xml_path = $xml_path;
		$this->schema_path = $schema_path;
	}

	function validate(){
		libxml_use_internal_errors(true);
		$xml = new DOMDocument();
		$xml->load($this->xml_path);
		if($xml->schemaValidate($this->schema_path)){
			echo "The xml is valid\n";
		}else{
			$this->pretty_print_errors();
		}
	}

	function pretty_print_errors(){
		$errors = libxml_get_errors();
		$error_count = count($errors);
		echo "Total num of errors is: $error_count\n";

		for($i = 0; $i < $error_count; $i++){
			$this->fmt_error_with_num($i＋1,$errors[$i]);
		}
		libxml_clear_errors();
	}

	function fmt_error_with_num($num, $error){
		echo "Error $num: ".trim($error->message)." in file " . $error->file . " on line " .$error->line. "\n";
	}
	
}

$xml_validation = new XMLValidation("test.xml","test.xsd");
$xml_validation->validate();
?>

test.xsd:

<?xml version="1.0" encoding="ISO-8859-1"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
	<xs:simpleType name="stringType">
		<xs:restriction base="xs:string">
			<xs:pattern value="[a-z]{6}"/>
		</xs:restriction>
	</xs:simpleType>

	<xs:element name="person">
		<xs:complexType>
			<xs:sequence>
				<xs:element name="name" type="stringType" minOccurs="0"/>
				<xs:element name="age" type="xs:positiveInteger"/>
				<xs:element name="address" type="xs:string"/>
				<xs:element name="city" type="xs:string"/>
				<xs:element name="country" type="xs:string"/>
			</xs:sequence>
			<xs:attribute name="person_id" type="xs:string" use="required"/>
		</xs:complexType>
	</xs:element>
</xs:schema>

test.xml

<?xml version="1.0"?>
<person>
	<name>133</name>
	<age>22</age>
	<address>beijing haidian</address>
	<city>beijing</city>
	<country>China</country>		
</person>

输出结果：

引用

Error 1: Element 'person': The attribute 'person_id' is required but missing. in file /home/fuliang/program/php/test.xml on line 2
Error 2: Element 'name': [facet 'pattern'] The value '133' is not accepted by the pattern '[a-z]{6}'. in file /home/fuliang/program/php/test.xml on line 3
Error 3: Element 'name': '133' is not a valid value of the atomic type 'stringType'. in file /home/fuliang/program/php/test.xml on line 3

重新修改一下xml

<?xml version="1.0"?>
<person person_id="123">
	<name>aaaaaa</name>
	<age>22</age>
	<address>beijing haidian</address>
	<city>beijing</city>
	<country>China</country>		
</person>

输出信息：

引用

The xml is valid

需要注意的是行号类型是short的，超过65535就会越界，需要自己纠正这个错误。