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PHP DOMNode isSupported()用法及代码示例


DOMNode::isSupported()函数是PHP中的内置函数,用于检查指定版本是否支持所要求的函数。

用法:

bool DOMNode::isSupported( string $feature, string $version )

参数:该函数接受上述和以下描述的两个参数:


  • $feature:它指定要测试的函数。
  • $version:它指定要测试的函数的版本。

返回值:如果成功,则此函数返回TRUE;如果失败,则返回FALSE。

以下示例说明了PHP中的DOMNode::isSupported()函数:

范例1:

<?php 
  
// Write the feature name 
$featureName1 = "Core"; 
  
// Check if it exists 
$node1 = new DOMNode(); 
$isSupported1 = $node1->isSupported($featureName1, '1.0'); 
if ($isSupported1) { 
    echo "Has feature $featureName1 module<br>"; 
} 
  
// Write another feature name 
$featureName2 = "XML"; 
  
// Check if it exists 
$isSupported2 = $node1->isSupported($featureName2, '2.0'); 
if ($isSupported2) { 
    echo "Has feature $featureName2 module"; 
} 
?>

输出:

Has feature Core module
Has feature XML module

范例2:

<?php 
  
// Write the feature name 
$featureName1 = "Events"; 
  
// Check if it exists 
$node1 = new DOMNode(); 
$isSupported1 = $node1->isSupported($featureName1, '1.0'); 
if (!$isSupported1) { 
    echo "Doesn't has feature $featureName1 module<br>"; 
} 
  
// Write another feature name 
$featureName2 = "CSS"; 
  
// Check if it exists 
$isSupported2 = $node1->isSupported($featureName2, '2.0'); 
if (!$isSupported2) { 
    echo "Doesn't has feature $featureName2 module"; 
} 
?>

输出:

Doesn't has feature Events module
Doesn't has feature CSS module

参考: https://www.php.net/manual/en/domnode.issupported.php



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注:本文由纯净天空筛选整理自gurrrung大神的英文原创作品 PHP | DOMNode isSupported() Function。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。