![]() ![]() It takes an array that contains key-value pairs and returns an array where they are actually the key and value. Here's a function I needed to collapse an array, in my case from a database query. It will help to debug when you don?t have control of depths. This function will print all the keys of a multidimensional array in html tables. NOTE: If the sub element isn't an array, it will be ignore. An optional MAXIMUM DEPTH parameter can be set for testing purpose in case of very large arrays. An indexed array is the simplest form of array in PHP. You can create an array in PHP either by using the array () function or placing the array elements inside the square brackets. There are three types of arrays including the indexed, associative, and multidimensional arrays. ![]() Here's a way to find all the keys from a multidimensional array while keeping the array structure. A PHP array variable holds multiple values simultaneously. There's a lot of multidimensional array_keys function out there, but each of them only merges all the keys in one flat array. 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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