PHP MySQLi: debug() function
mysqli_debug() function / mysqli::debug
The mysqli_debug() function / mysqli::debug is used to perform debugging operations.
Note: In order to use this function, you must compile the MySQL client library to support debugging.
Syntax:
Object oriented style
bool mysqli::debug ( string $message )
Procedural style
bool mysqli_debug ( string $message )
Usage: Procedural style
mysqli_debug(message);
Parameter:
| Name | Description | Required/Optional |
|---|---|---|
| massage | A string that represents the debugging operation to perform | Required |
Return value:
Returns TRUE.
Version: PHP 5, PHP 7
Example:
<?php
/* Create a trace file in '/tmp/client.trace' on the local (client) machine: */
mysqli_debug("d:t:o,/tmp/client.trace");
?>
See also
Previous: connect
Next: dump_debug_info
PHP: Tips of the Day
To use the constant simply use its name:
Example:
if (EARTH_IS_FLAT) {
print "Earth is flat";
}
print APP_ENV_UPPERCASE;
Output:
or if you don't know the name of the constant in advance, use the constant function:
// this code is equivalent to the above code
$const1 = "EARTH_IS_FLAT";
$const2 = "APP_ENV_UPPERCASE";
if (constant($const1)) {
print "Earth is flat";
}
print constant($const2);
Output:
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