debug_print.php

<?php

error_log(__METHOD__ . ':' . __LINE__); // debug

error_log(__METHOD__ . ':' . __LINE__ . ': message'); // debug

error_log(__METHOD__ . ':' . __LINE__ . ': gettype($value) = ' . gettype($value)); // debug

error_log(__METHOD__ . ':' . __LINE__ . ': get_class($object) = ' . get_class($object)); // debug

error_log(__METHOD__ . ':' . __LINE__ . ': $class is defined in ' . (new ReflectionClass($class))->getFileName()); // debug

error_log(__METHOD__ . ':' . __LINE__ . ': $variable = ' . var_export($variable, true)); // debug

error_log(__METHOD__ . ':' . __LINE__ . ': $variable = ' . print_r($variable, true)); // debug

error_log(__METHOD__ . ':' . __LINE__ . ': debug_backtrace = ' . print_r(debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS), true)); // debug

error_log(__METHOD__ . ':' . __LINE__ . ': debug_backtrace = ' . var_export(array_map(
    function ($a) { return isset($a['file'])
        ? $a['file'] . ':' . $a['line']
        : $a['function']
        ;
    },
    debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS)
), true)); // debug

for ($p = $e, $a = []; $p; $p = $p->getPrevious()) {
    $a[] = __METHOD__ . ':' . __LINE__ . ': ' . get_class($p) . ' (' . $p->getCode() . ') "' . $p->getMessage() . '"' . "\n" .
        $p->getFile() . ':' . $p->getLine() . "\n" .
        $p->getTraceAsString();
}
$m = implode("\n", $a);
error_log($m); // debug