My goal is to execute PhantomJS by using:

// adding $op and $er for debugging purposes

exec('phantomjs script.js', $op, $er);

print_r($op);

echo $er;

And then inside script.js, I plan to use multiple page.open() to capture screenshots of different pages such as:

var url = 'some dynamic url goes here';

page = require('webpage').create();

page.open(url, function (status) {

    console.log('opening page 1');  

    page.render('./slide1.png');            

});



page = require('webpage').create();

page.open(url, function (status) {

    console.log('opening page 2');  

    page.render('./slide2.png');        

});



page = require('webpage').create();

page.open(url, function (status) {

    console.log('opening page 3');  

    page.render('./slide3.png');        

    phantom.exit(); //<-- Exiting phantomJS only after opening all 3 pages

});

On running exec, I get the following output on page:

Array ( [0] => opening page 3 ) 0

As a result I only get the screenshot of the 3rd page. I'm not sure why PhantomJS is skipping the first and second blocks of code (evident from the missing console.log() messages that were supposed to be output from 1st and 2nd block) and only executing the third block of code.