PHP reads CDATA values within XML data

When the development process encounters an XML fetch when the add CDATA cannot read the internal values
$content = simplexml_load_string (" Hello, world! );
Echo (string) $content;
$foo = simplexml_load_string (" Hello, world! );
Echo (string) $foo->content;
Automatically filter CDATA internal parameters using the following method
$content = simplexml_load_string (" Hello, world! ', null, libxml_nocdata);
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