The DOMImplementation::hasFeature() function is an inbuilt function in PHP which is used to test if the DOM implementation implements a specific feature or not.
Syntax:
bool DOMImplementation::hasFeature( string $feature, string $version )
Parameters: This function accepts two parameters as mentioned above and described below:
- $feature: It specifies the feature to test.
- $version: It specifies the version number of the feature to test.
Return Value: This function returns TRUE on success or FALSE on failure.
Exceptions: This function throws E_STRICT exception on error.
Below examples illustrate the DOMImplementation::hasFeature() function in PHP:
Example 1:
<?php // Write the feature name $featureName1 = "Core" ;
// Check if it exists $hasFeature1 =
DOMImplementation::hasFeature( $featureName1 , '1.0' );
if ( $hasFeature1 ) {
echo "Has feature $featureName1 module <br>" ;
} // Write another feature name $featureName2 = "XML" ;
// Check if it exists $hasFeature2 =
DOMImplementation::hasFeature( $featureName2 , '2.0' );
if ( $hasFeature2 ) {
echo "Has feature $featureName2 module <br>" ;
} ?> |
Output:
Has feature Core module Has feature XML module
Example 2:
<?php // Write the feature name $featureName1 = "Events" ;
// Check if it doesn't exists $hasFeature1 =
DOMImplementation::hasFeature( $featureName1 , '1.0' );
if (! $hasFeature1 ) {
echo "Doesn't have feature $featureName1 module. <br>" ;
} // Write another feature name $featureName2 = "CSS" ;
// Check if it doesn't exists $hasFeature2 =
DOMImplementation::hasFeature( $featureName2 , '2.0' );
if (! $hasFeature2 ) {
echo "Doesn't have feature $featureName2 module. <br>" ;
} ?> |
Output:
Doesn't have feature Events module. Doesn't have feature CSS module.
Reference: https://www.php.net/manual/en/domimplementation.hasfeature.php