How to implement a callback in PHP

0 votes
can someone help me out how to implement callback function in php?
Apr 15, 2020 in PHP by kartik
• 37,490 points
93 views

1 answer to this question.

0 votes

Hello,

Implementation of a callback is done like so

// This function uses a callback function. 
function doIt($callback) 
{ 
    $data = "this is my data";
    $callback($data); 
} 


// This is a sample callback function for doIt(). 
function myCallback($data) 
{ 
    print 'Data is: ' .  $data .  "\n"; 
} 


// Call doIt() and pass our sample callback function's name. 
doIt('myCallback');

Displays: Data is: this is my data

Thank You!!

answered Apr 15, 2020 by Niroj
• 82,560 points

Related Questions In PHP

0 votes
1 answer

How to resolve the problem of losing a session after a redirect in PHP?

Hello @kartik, Carry out these usual checks: Make sure session_start(); is ...READ MORE

answered Aug 24, 2020 in PHP by Niroj
• 82,560 points
3,524 views
0 votes
1 answer

How to properly URL encode a string in PHP?

Hello @kartik, For the URI query use urlencode/urldecode; for ...READ MORE

answered Oct 18, 2020 in PHP by Niroj
• 82,560 points
448 views
0 votes
1 answer

How to convert a string to JSON object in PHP?

Hello @kartik, it seems that your JSON is ...READ MORE

answered Oct 20, 2020 in PHP by Niroj
• 82,560 points
299 views
0 votes
1 answer

How to add a line break within echo in PHP?

Hello @kartik, You have to use br when ...READ MORE

answered Oct 27, 2020 in PHP by Niroj
• 82,560 points
103 views
0 votes
1 answer

Why it is necessary to refresh CSRF token per form request?

Hello, Generating a new CSRF token for each ...READ MORE

answered Mar 19, 2020 in Laravel by Niroj
• 82,560 points
1,545 views
0 votes
1 answer

What is meant by passing the variable by value and reference in PHP?

Hello, When the variable is passed as value ...READ MORE

answered Mar 27, 2020 in PHP by Niroj
• 82,560 points
288 views
0 votes
1 answer

Connection with MySQL server using PHP. How can we do that?

Hey @kartik, You have to provide MySQL hostname, ...READ MORE

answered Mar 27, 2020 in PHP by Niroj
• 82,560 points
149 views
0 votes
1 answer

How to retrieve or obtain data from the MySQL database using PHP?

Hello kartik,  Actually there are many functions that  ...READ MORE

answered Mar 27, 2020 in PHP by Niroj
• 82,560 points
275 views
0 votes
1 answer

How can I connect to a Tor hidden service using CURL in PHP?

Hello @kartik, I use Privoxy and cURL to scrape Tor ...READ MORE

answered May 19, 2020 in PHP by Niroj
• 82,560 points
1,324 views
0 votes
1 answer

How do I convert a PDF document to a preview image in PHP?

Hello @kartik, You need ImageMagick and GhostScript <?php $im = new imagick('file.pdf[0]'); $im->setImageFormat('jpg'); header('Content-Type: image/jpeg'); echo ...READ MORE

answered Aug 14, 2020 in PHP by Niroj
• 82,560 points
880 views