WarpConduit Computing

  • Quick Tips
  • Web Design & Development
  • WordPress Plugins
  • Home
  • Passphrase Generator
  • Password Generator
  • About
  • Contact

PHP’s in_array() vs. jQuery’s inArray()

October 6, 2010 by Josh Hartman

This one stumped me for a bit when i was trying to use jQuery to populate checkboxes with a list of items pulled from a database using PHP.

The fact of the matter is that PHP’s in_array() returns a boolean whereas jQuery’s inArray() returns the index of the matching element, or if the element is not found it will return -1 or undefined, depending on the browser.

Problem

If you are used to using PHP like me jQuery’s inArray() can give you a headache when you are using the returned value of the function in an if-else condition. This is because -1 evaluates as true, when you really want it to evaluate as false.

Solution

Make it so that your if-else condition checks for a value >=0 (greater than or equal to zero). Since array’s don’t have negative indexes you’re safe doing it this way.

What did i learn from this? When working with a new function check the documentation for what type of data it will return.

jQuery.inArray Documentation

Example


Filed Under: Web Design & Development Tagged With: in_array, inarray, jquery, php

Connect

  • Facebook
  • GitHub
  • RSS
  • Twitter
  • YouTube

Recent Posts

  • Extremely Useful Applications for Web Development and IT Tasks
  • Installing BookStack Wiki on cPanel Shared Hosting
  • Media (MIME) Type Reference List

Tags

automatic benchmark cbc cipher class comparisons cpanel credit memo css decrypt encrypt font gzip htaccess html image increment javascript jquery list magento mcrypt mysql number old opencart order php profiling random redirect repository rijndael shipment software strict ubuntu url wincachegrind windows windows 7 wordpress xampp xdebug xss

Blogroll

  • CodeIgniter
  • Fusion Forward
  • jQuery
  • Nettuts+
  • Smashing Magazine

© 2023 WarpConduit Computing. All Rights Reserved.