![]() Remember in PHP, arrays are zero-based, meaning they start from zero, not 1. First being at position 0 and the second being at position 1. If we take a look at the array, it only contains two elements. In the following example, when attempting to echo key '3' from our array, PHP triggers an Undefined array key 3. ![]() Have you ever seen this PHP warning in your logs "Warning: Undefined array key x in y"? Let's find out why this might occur and inspect what's going on. With easy-to-follow PHP code examples shown along the way, let's explore how to prevent the PHP warning undefined array key. But was does it mean and how can it be prevented? We will explore why it occurs and how we can amend our code to avoid filling up our PHP error logs with such warnings. This function based on quecoder at gmail's combine_arr() below allowed me to pad either array or not when parsing my CSVs to arrays.When working with PHP, there is no doubt that at some point in your coding journey, you've experienced the undefined array key warning in PHP. Then I ran into a problem when you have empty columns at the end of a row because array_combine returns false if both arrays don't have the same number of elements. I needed to read CSV files into associative arrays with column headers as keys. ![]() I needed a function that would take keys from one unequal array and combine them with the values of another. Print_r ( array_combine_array (array(),array( 'english' => $a1 ),array( 'french' => $a2 ),array( 'spanish' => $a3 ))) /* Auto-made index, associative subarray indexes */ Print_r ( array_combine_array ( $r, $a1, $a2, $a3 )) /* Associative index, auto-made subarray indexes */ Print_r ( array_combine_array ( $r, $a1 ,array( 'french' => $a2 ),array( 'spanish' => $a3 ))) /* Ouputs Error */ Print_r ( array_combine_array ( $r ,array( 'english' => $a1 ),array( 'french' => $a2 ),array( 'spanish' => $a3 ))) /* Associative index, associative subarray indexes */ * Making the array with auto-made index */ * Cycling on each keys values, making an offset for each */ If (empty( $keys )) $keys = array_keys ( array_fill ( 0, max (( $assocArray ) ? array_map ( 'count', array_map ( 'current', $arrays )) : array_map ( 'count', $arrays )), 'foo' )) * If empty $Keys is given, we fill an empty array */ ![]() $assocArray = is_array ( array_shift ( array_map ( 'current', $arrays ))) * Checking the model of arrays, array('INDEX' => array()) or Array() */ $check = count ( array_unique ( array_map ( 'is_array', array_map ( 'current', $arrays )))) = 1 I was looking for a function that could combine an array to multiple one, for my MySQL GROUP_CONCAT() query, so I made this function. Getting Started Introduction A simple tutorial Language Reference Basic syntax Types Variables Constants Expressions Operators Control Structures Functions Classes and Objects Namespaces Enumerations Errors Exceptions Fibers Generators Attributes References Explained Predefined Variables Predefined Exceptions Predefined Interfaces and Classes Predefined Attributes Context options and parameters Supported Protocols and Wrappers Security Introduction General considerations Installed as CGI binary Installed as an Apache module Session Security Filesystem Security Database Security Error Reporting User Submitted Data Hiding PHP Keeping Current Features HTTP authentication with PHP Cookies Sessions Dealing with XForms Handling file uploads Using remote files Connection handling Persistent Database Connections Command line usage Garbage Collection DTrace Dynamic Tracing Function Reference Affecting PHP's Behaviour Audio Formats Manipulation Authentication Services Command Line Specific Extensions Compression and Archive Extensions Cryptography Extensions Database Extensions Date and Time Related Extensions File System Related Extensions Human Language and Character Encoding Support Image Processing and Generation Mail Related Extensions Mathematical Extensions Non-Text MIME Output Process Control Extensions Other Basic Extensions Other Services Search Engine Extensions Server Specific Extensions Session Extensions Text Processing Variable and Type Related Extensions Web Services Windows Only Extensions XML Manipulation GUI Extensions Keyboard Shortcuts ? This help j Next menu item k Previous menu item g p Previous man page g n Next man page G Scroll to bottom g g Scroll to top g h Goto homepage g s Goto search ![]()
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