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<?php
error_reporting(E_ALL | E_STRICT);
ini_set('display_errors', 1);
ini_set('log_errors', 1);
ini_set('log_errors_max_len', 0); /* unlimited */
ini_set('error_log', './php_errors.log');
register_shutdown_function(function() {
// error_log func not available here due to fatal php shutdown
//error_log(print_r(debug_backtrace(), TRUE));
});
function a($arg) {
b('beta');
}
function b($arg) {
c('charlie');
}
function c($arg) {
d('delta');
}
function d($arg) {
/* calling error_log in register_shutdown_function is too late, however var_dump still works there, in case of error
* in real code insert the line below above the line causing trouble
*/
error_log(print_r(debug_backtrace(), TRUE));
/* nicer output */
$e = new Exception;
error_log($e->getTraceAsString());
/* print to screen in simple format */
print mydebug_bt();
trigger_error("user triggered error", E_USER_ERROR);
}
error_log('calling a()', 0, './php_errors.log');
a('alpha');
/* simplify and beatify the output of a dump of debug_backtrace() */
function mydebug_bt() {
$stack = '';
$i = 1;
$trace = debug_backtrace();
unset($trace[0]); // remove call to this function from stack trace
foreach($trace as $node) {
$stack .= "#$i ".$node['file'] ."(" .$node['line']."): ";
if(isset($node['class'])) {
$stack .= $node['class'] . "->";
}
$stack .= $node['function'] . "()" . PHP_EOL;
$i++;
}
return $stack;
}
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