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PHP vs Node.js: Synchronous vs Asynchronous
console.log("Before the first file is read.");
hypotheticalFileGetContents("sample.txt", function(fileContents){
// fileContents now contains the file contents, this function is only called when the file read in the background has finished
console.log("After the first file has completed reading.");
});
// You've now told it to start the first read, but it won't 'block' your script execution. It will do the read in the background, and immediately move on with the rest of your code.
console.log("Before the second file is read.");
hypotheticalFileGetContents("sample2.txt", function(fileContents){
// fileContents now contains the file contents, this function is only called when the file read in the background has finished
console.log("After the second file has completed reading.");
});
/* Output could look something like this:
Before the first file is read.
Before the second file is read.
After the first file has completed reading.
After the second file has completed reading.
*/
<?php
echo("Before the first file is read.");
$fileContents = file_get_contents("sample.txt"); // You can't do anything while the file is being read, your script is 'stuck'.
echo("After the first file has completed reading.");
echo("Before the second file is read.");
$fileContents = file_get_contents("sample2.txt"); // You can't do anything while the file is being read, your script is 'stuck'.
echo("After the second file has completed reading.");
/* Output always looks like this:
Before the first file is read.
After the first file has completed reading.
Before the second file is read.
After the second file has completed reading.
*/
@josephcode773

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@josephcode773 josephcode773 commented Apr 1, 2017

Thank you for this. It really helped with my understanding.

@Praveenunimity

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@Praveenunimity Praveenunimity commented Nov 30, 2018

Thank You. It really helps to sort out the difference between Synchronous vs Asynchronous.

@DanielAdek

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@DanielAdek DanielAdek commented Aug 2, 2019

👍 Thanks Bro, you've turned on the light on Synchronous vs Asynchronous.

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