php debugging techniques code example

Example 1: php best debugging functions

<?php
$myVar = "hello world!";

var_dump($myVar);
print_r($myVar);

$allVars = get_defined_vars();
print_r($allVars);
debug_zval_dump($allVars);

function sayHello($hello) {
    echo $hello;
    debug_print_backtrace();
}

sayHello($myVar);
?>

Example 2: php best debugging functions

I am using two ways to debug code

one is print the data and die the function in specific point.
 
     print_r($data);die;

second one is writing log file in specific point in code.

function write_log($log_msg)
{
    $log_filename = "logs";
    if (!file_exists($log_filename)) 
    {
        mkdir($log_filename, 0777, true);
    }
    $log_file_data = $log_filename.'/debug.log';
  file_put_contents($log_file_data, $log_msg . "\n", FILE_APPEND);
    
} 

write_log("Writing Log");
$a = array(
        array('id' => '1','date' => '09-04-2018','length' => '10'),
        array('id' => '2','date' => '09-04-2018','length' => '20'),
        array('id' => '1','date' => '10-04-2018','length' => '11')
    );
write_log(print_r($a,1));

Example 3: php best debugging functions

I find it very useful to print out to the browsers console instead of just var_dumping:

function console_log( $data ){
  echo '<script>';
  echo 'console.log('. json_encode( $data ) .')';
  echo '</script>';
}

Usage:
$myvar = array(1,2,3);
console_log( $myvar ); // [1,2,3]

Example 4: Best debugging tools for php

Xdebug, PHP DebugBar , MacGDBp, Kint, Whoops, Krumo, Pinba, Gubed PHP Debugger, DBG, and PHP_Dyn are some best debugging tools for php.