When using libxml_use_internal_errors(true), and perform a possibly memory intensive operation like simplexml_load_string() next, you might end up with a blank screen and no php error logged because the error message been suppressed.
(PHP 5 >= 5.1.0, PHP 7)
libxml_use_internal_errors — Disable libxml errors and allow user to fetch error information as needed
$use_errors = FALSE
] ) : boollibxml_use_internal_errors() allows you to disable standard libxml errors and enable user error handling.
use_errors
Enable (TRUE) user error handling or disable (FALSE) user error handling. Disabling will also clear any existing libxml errors.
This function returns the previous value of
use_errors.
Example #1 A libxml_use_internal_errors() example
This example demonstrates the basic usage of libxml errors and the value returned by this function.
<?php
// enable user error handling
var_dump(libxml_use_internal_errors(true));
// load the document
$doc = new DOMDocument;
if (!$doc->load('file.xml')) {
foreach (libxml_get_errors() as $error) {
// handle errors here
}
libxml_clear_errors();
}
?>
以上例程会输出：
bool(false)
When using libxml_use_internal_errors(true), and perform a possibly memory intensive operation like simplexml_load_string() next, you might end up with a blank screen and no php error logged because the error message been suppressed.
We use a custom error handler using set_error_handler() I found that after I call
libxml_use_internal_errors(false);
It resets my error_handler - not sure if this is a bug or not, I will report it as a bug - however, I needed to repeat my call to set_error_handler
(did confuse me for a while)
When using this funtion, be sure to clear your internal error buffer. If you dn't and you are using this in a long running process, you may find that all your memory is used up.