print_r_pre, var_dump_pre, print_r_console, var_dump_console

debug_functions.php

<?php
/*
 * Date: 17/03/2014
 * Author     : RobertoPC
 * Author URI : http://www.robertopc.com.br
 * Gist URI   : https://gist.github.com/robertopc/43bcf4d28a32bc95956f
 * Description: Functions to debug code in PHP
 * Functions  : print_r_pre, var_dump_pre, print_r_console, var_dump_console
 * Version    : 1.0
 * License    : MIT
*/

// verify if the function was declared for prevent errors
if( ! function_exists('print_r_pre') ){

	// print_r of the php into <pre> tags
	function print_r_pre( $data ) {

		print'<pre>print_r_pre &gt;<br><br>';
		print_r( $data );
		print'<br>&lt; print_r_pre</pre>';
	}
	// end print_r_pre
}
// verify if the function was declared for prevent errors
if( ! function_exists('var_dump_pre') ) {

	// var_dump of the php into <pre> tags
	function var_dump_pre( $data ) {

		print'<pre>var_dump_pre &gt;<br><br>';
		var_dump( $data );
		print'<br>&lt; var_dump_pre</pre>';
	}
	// end var_dump_pre
}
// verify if the function was declared for prevent errors
if( ! function_exists('print_r_console') ) {

	// print_r of the php in the browser console
	function print_r_console( $data ) {

		// begin console.log
		print"<script>";
		print"console.log('print_r_console >\\n\\n'+\n";
		// get print_r string
		$print_r_string = print_r( $data, true );
		// split lines by line-break
		$print_r_string_split = preg_split( "/\n|\r\n|\r/", $print_r_string );
		foreach( $print_r_string_split as $row ) {

			// print lines
			print "'". addslashes( $row ) ."\\n'+";
		}
		// end console.log
		print"'< print_r_console');</script>";
	}
	// end print_r_console
}
// verify if the function was declared for prevent errors
if( ! function_exists('var_dump_console') ) {

	// var_dump of the php in the browser console
	function var_dump_console( $data ) {

		// begin console.log
		print"<script>";
		print"console.log('var_dump_console >\\n\\n'+\n";
		// start capture from output buffer
		ob_start();
		var_dump( $data );
		// get var_dump string from buffer
		$var_dump_string = ob_get_contents();
		ob_end_clean();
		// split lines by line-break
		$var_dump_string_split = preg_split( "/\n|\r\n|\r/", $var_dump_string );
		foreach( $var_dump_string_split as $row ) {
            
			// print lines
			print "'". addslashes( $row ) ."\\n'+";
		}
		// end console.log
		print"'< var_dump_console');</script>";
	}
	// end var_dump_console
}