If you need show some errors in your php code - use this php notation:

// enable showing errors in PHP
ini_set('error_reporting', E_ALL & ~E_NOTICE & ~E_WARNING & ~E_STRICT);
ini_set('display_errors','On');

function compresscss ( $data, $url ) {
        global $current_css_url;
        $current_css_url = $url;
        /* remove comments */
        $data = preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!', '', $data);
        /* remove tabs, spaces, new lines, etc. */
        $data = str_replace(array("\r\n", "\r", "\n", "\t", '  ', '    ', '    '), ' ', $data);
        /* remove unnecessary spaces */
        $data = preg_replace('/[ ]+([{};,:])/', '\1', $data);
        $data = preg_replace('/([{};,:])[ ]+/', '\1', $data);
        /* remove empty class */
        $data = preg_replace('/(\}([^\}]*\{\})+)/', '}', $data);
        /* remove PHP code */
        $data = preg_replace('/<\?(.*?)\?>/mix', '', $data);
        /* replace url*/
        $data = preg_replace_callback('/url\(([^\)]*)\)/', 'replaceurl', $data);
        return $data;
}

// Unset unwanted Scripts - by name
$unset_scripts = array(
	'k2',
	'...',
);

foreach($this->_scripts as $name=>$script)
{
	if (!preg_match('#(' . implode('|', $unset_scripts) . '#i', $name))
	{
		continue;
	}

	unset($this->_scripts[$name]);
}

or if you use joomla v3.8.1 you can try this php code:

<?php
	$doc = JFactory::getDocument();
	unset($doc->_scripts[JURI::root(true) . '/media/system/js/mootools-more.js']);
	unset($doc->_scripts[JURI::root(true) . '/media/system/js/mootools-core.js']);
	unset($doc->_scripts[JURI::root(true) . '/media/system/js/core.js']);
	unset($doc->_scripts[JURI::root(true) . '/media/system/js/modal.js']);
	unset($doc->_scripts[JURI::root(true) . '/media/system/js/caption.js']);
	unset($doc->_scripts[JURI::root(true) . '/media/jui/js/jquery.min.js']);
	unset($doc->_scripts[JURI::root(true) . '/media/jui/js/jquery-noconflict.js']);
	unset($doc->_scripts[JURI::root(true) . '/media/jui/js/bootstrap.min.js']);
?>

if you wand disable all js & css scripts - use code:

$doc->_scripts     = null;
$doc->_script      = null;
$doc->_styleSheets = null;

For example we have text

<strong>
                     
                         
                            The Times
                          
                        NY
                     
                </strong>

 But good result need be

<strong>The Times NY</strong>

 I make regexp in php

function trim_text($str)                             
{                                                    
    return trim(preg_replace('/\s{2,}/', ' ', $str));                                                 
}

We will proceed by installing PHP 5.5, PHP 5.6, PHP 7.0, and PHP 7.1 and using a simple script to switch between them as we need.

$ brew install php55 --with-apache
$ brew unlink php55
$ brew install php56 --with-apache
$ brew unlink php56
$ brew install php70 --with-apache
$ brew unlink php70
$ brew install php71 --with-apache

 Let's do it!

brew install php71

Or use this code and install php 7.3 without brew

curl -s https://php-osx.liip.ch/install.sh | bash -s 7.3

and after that run this in terminal

export PATH=/usr/local/php5/bin:$PATH

But, we looking Error:

==> Installing php71 from josegonzalez/php
Error: Cannot install josegonzalez/php/php71 because conflicting formulae are installed.

  php55: because different php versions install the same binaries.

Please `brew unlink php55` before continuing.

Unlinking removes a formula's symlinks from /usr/local. You can
link the formula again after the install finishes. You can --force this
install, but the build may fail or cause obscure side-effects in the
resulting software.

Dont panic! :-) Run unlink command:

brew unlink php55

# Unlinking /usr/local/Cellar/php55/5.5.38_11... 17 symlinks removed

Then try again:

brew install php71


# ==> Summary
# ?  /usr/local/Cellar/php71/7.1.0_11: 342 files, 39.7M

Then try our php version

php -v

PHP 7.1.0 (cli) (built: Dec  2 2016 03:30:24) ( NTS )
Copyright (c) 1997-2016 The PHP Group
Zend Engine v3.1.0-dev, Copyright (c) 1998-2016 Zend Technologies

What you can do if you type php -v and show php v5.5?

open terminal and put this code and press Enter

export PATH=/usr/local/php5/bin:$PATH

<?php  

if ( ! function_exists ( 'yours_func' )) {
    function yours_func() {
     ...
    }
 }

?>

Use simple script

<?php

/**
 * @param $path
 */
function readDir($path){
	$d=dir($path);  
	while(false!==($entry=$d->read())){
	  if(($entry== '.')||($entry=='..'))continue; 
			if(is_dir($path.'/'.$entry)){
				readDir($path.'/'.$entry);
			}  
	echo $path.'/'.$entry."<br />\n";  
	}  
	$d->close();  
}

readDir(getcwd());

?>