Does $val make a COPY of the value? That's what MANY people think. And the value at the current offset (a PHP "zval") is assigned to a variable called $val. Next, it uses that copied iteration offset to loop through all key/value pairs of the array (ie 0th key, 1st key, 2nd key, etc.). The array itself wasn't passed by reference to the function, so PHP knows that it isn't allowed to modify the outside array, so it therefore makes a copy of the array's internal iteration offset state (that's just a simple number which says which item you are currently at during things like foreach()), which costs almost no performance or memory at all since it's just a small number. The array function argument itself isn't passed by reference, so the function knows it isn't allowed to modify the original at all. This function takes an array as argument ($arr). Lots of people think the answer is two() because it uses "reference to value, which it doesn't have to copy each value when it loops". WARNING: Looping through "values by reference" for "extra performance" is an old myth. Then we have removed the duplicate values from the array using the foreach loop.Getting Started Introduction A simple tutorial Language Reference Basic syntax Types Variables Constants Expressions Operators Control Structures Functions Classes and Objects Namespaces Errors Exceptions Generators Attributes References Explained Predefined Variables Predefined Exceptions Predefined Interfaces and Classes 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 At first, we used the array_unique() function, a predefined PHP function that removes the array duplicate values from the array. Here, we have discussed two methods with the help of which we can remove the duplicate values from an array. In this lesson, we have learned how to remove duplicate values from an array in PHP. Īrray ( => HTML => CSS => JavaScript => PHP => jQuery ) Conclusion In the given example, we have removed the duplicate values from the given array using the foreach loop. Example: Remove duplicate values from an array We have removed the duplicate values from the array. Here, we will iterate the array using the foreach loop and then using the in_array() function. We can also remove duplicate values from an array without using the PHP function. Īrray ( => HTML => CSS => JavaScript => PHP => jQuery ) Removing Using foreach loop In the given example, we have removed the duplicate values from the array using PHP predefined function array_unique() function. Example: Removing duplicate values from an array The function takes an array as its value and returns a new array with zero duplicate values. If any value is present more than once, then this function will keep the first occurrence and remove all the remaining duplicates. We can remove the duplicate values from the array using the PHP array_unique() function.
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