Array Undefined Index Error In Php
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Undefined Index Error In Php Post
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How To Remove Undefined Index Error In Php
programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Array Undefined index error (notice) in PHP up vote 0 down vote favorite I have this function: function coin_matrix($test, $revs) { $coin = array(); for ($i = 0; $i < count($test); $i++) { foreach ($revs as $j => $rev) undefined index error in php session { foreach ($revs as $k => $rev) { if ($j != $k && $test[$i][$j] != null && $test[$i][$k] != null) { $coin[$test[$i][$j]][$test[$i][$k]] += 1 / ($some_var - 1); } } } } return $coin; } where $test = array( array('3'=>'1','5'=>'1'), array('3'=>'2','5'=>'2'), array('3'=>'1','5'=>'2'), array('3'=>'1','5'=>'1')); and $revs = array('3'=>'A','5'=>'B'); the problem is that when I run it, it returns these errors (notices): Notice: Undefined index: 1 at line 10 Notice: Undefined index: 1 at line 10 Notice: Undefined index: 2 at line 10 Notice: Undefined index: 2 at line 10 Notice: Undefined index: 2 at line 10 Notice: Undefined index: 1 at line 10 which is this line: $coin[$test[$i][$j]][$test[$i][$k]] += 1 / ($some_var - 1); The problem is that at the end the function returns the correct matrix (array) and if I test to see if $coin[$test[$i][$j]][$test[$i][$k]] exists, then it doesn't return it anymore. Any suggestion is greatly appreciated! Thanks! php arrays undefined-index share|improve this question edited Apr 20 '10 at 15:56 asked Apr 20
/ offset errors in PHP. What is an index?Firstly, you need to understand what an index is. When an element is added to an array, it is given an index (you can set this manually
What Is Means By Undefined Index Error In Php
or PHP will automatically set one for you). This index acts as an identifier
Php Undefined Index Array Key Exists
that allows you to interact with the element in question. Without array indexes, you would be unable to keep track php multidimensional array undefined index of which element is which.For example, in PHP, I can create an array like so:PHP 'Cat', 1 => 'Dog', 2 => 'Bird' );1234567 'Cat',1 => http://stackoverflow.com/questions/2676537/array-undefined-index-error-notice-in-php 'Dog',2 => 'Bird');As you can see, Cat has the index "0" and Dog has the index "1". If I want to print the word "Cat" out onto the page, I will need to access the "Cat" element via its array index:PHP http://thisinterestsme.com/undefined-index-error-php/ "filed under". In a similar vein, if I want to print out the word "Dog", I can access it via the index "1":PHP
tour help Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta http://wordpress.stackexchange.com/questions/20815/why-on-earth-am-i-getting-undefined-index-errors Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us WordPress Development Questions Tags Users Badges Unanswered Ask Question _ WordPress Development Stack Exchange is a question and answer site for WordPress developers and administrators. Join them; it only undefined index takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Why on Earth am I getting “undefined_index” errors? up vote 4 down vote favorite Right, I'm banging my head against a wall here. I'm sure it's something incredibly simple undefined index error but I keep getting undefined index errors on all of these variables. function meta_genus_species() { global $post; if (isset($post)) { $custom = get_post_custom($post->ID); } if (isset($custom)) { $genus = $custom["genus"][0]; $species = $custom["species"][0]; $etymology = $custom["etymology"][0]; $family = $custom["family"][0]; $common_names = $custom["common_names"][0]; } ?>