![]() ![]() Then we have removed the duplicate values from the array using the foreach loop. ![]() 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. Please share all the relevant code (how you decode the JSON and whatever changes you may be doing after this loop that unsets elements). Īrray ( => HTML => CSS => JavaScript => PHP => jQuery ) Conclusion 1 Unsetting an array element cannot produce an object. 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. After removal the associated keys and values ( of other balance elements ) does not change. We can also remove duplicate values from an array without using the PHP function. This unset command takes the array key as input and remove that element from the array. 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. Once any of the inner array values (uniqueValue) met the condition (val uniqueValue) with the current iteration element from the outer loop, it skips the. If any value is present more than once, then this function will keep the first occurrence and remove all the remaining duplicates. ![]() Maybe PHP 7 will fix this madness, but at time of writing the stock PHP versions in Debian Jessie and Ubuntu Wily behave as outlined above.Īnyway, the short version is that you can avoid this by adding unset( $value ) immediately after the first foreach.We can remove the duplicate values from the array using the PHP array_unique() function. My intuition strongly suggests to me that $value should go out of scope after the first foreach loop, but apparently my intuition is wrong. Here, we will iterate the array using the foreach loop and then using the inarray() function. It is recommended to destroy it by unset().” As the PHP documentation states, “Reference of a $value and the last array element remain even after the foreach loop. The reason is that the first foreach loop passes values by reference ( &$value) while the second passes them by value ( $value). After going through the first foreach loop, array remains unchanged but, as explained above, value is left as a dangling reference to the last element in. Okay, so it’s not really inexplicable, just very unexpected. Solution To delete one element, use unset ( ): unset (array 3) unset (array 'foo') To delete multiple noncontiguous elements, also use unset ( ) : unset (array 3, array 5) unset (array 'foo', array 'bar') To delete multiple contiguous elements, use arraysplice ( ) : arraysplice (array, offset, length) 4.6.3. Yes, that’s right, the final key inexplicably appears to have the same value as the previous key, despite print_r suggesting otherwise. If you also expected that, you would be wrong. One solution would be to use the key of your items to remove them - you can both the keys and the values, when looping using foreach. Now, call me crazy, but I expect both the print_r call and the second foreach loop to return pretty much the same information: the keys, a to f, and their corresponding values, 1 to 6. Consider this slightly contrived example code: I just spent a couple of hours debugging something really counterintuitive, where PHP’s print_r seemingly told me that an array had different content to the content that the same array contained according to a foreach loop. ![]()
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