![]() Split string by one or more whitespace characters.Split string by any whitespace character.Trim specific characters from edges of the string.Insert substring at specific index in string.Insert character at specific index in string.Check if string value is a valid number.Check if string contains only uppercase.Check if string contains only lowercase.Check if string contains only numeric digits.Check if string contains only alphabets.Check if string ends with forward slash (/) character.Check if string ends with a punctuation.Check if string starts with a lowercase.Check if string starts with an uppercase.Check if string starts with specific character.Check if string ends with specific substring.Check if string starts with specific substring.Check if string contains specified substring.Check if strings are equal ignoring case.You can explore these to learn more about PHP. We have many fun articles related to PHP. The direct indexing approach is the most efficient. Finally, the article uses some popular PHP functions to change key value in an array. Starting with a foreach loop approach, the article moves to a more efficient direct indexing approach. This article focuses on how to update key value in array PHP. So, it may not be ideal to change key value in array PHP. However, this approach has an overhead of multiple function calls. Luckily, we don’t have to use the sort function here as the order is unchanged. Finally using the array_combine, it combines the updated keys array with the values from the input array.Once found, the key is replaced by the newer one.It then searches through the keys array using array_search to find the key to be replaced.It uses PHP array_keys to get an array of keys only.The function uses the array_key_exists check as seen already.Return array_combine($names, $students_score) Let’s jump to the example, and we’ll explain everything in the breakdown that follows it. #3 – Update key value in array PHP using array_searchĪlthough this approach isn’t more efficient than the second, we would try anyway. It sets a new key in the array and assigns it the score.Ĭompared to the loop approach, this approach is definitely more efficient in terms of complexity as it doesn’t need to traverse the whole array. ![]() Otherwise, it gets the score by the key – Direct Indexing.It returns the array as it is, if the key to be replaced doesn’t exist.Here’s how the function changes key value in array PHP. $students_score = $score //New key with the score. $score = $students_score //Get the score. If(!array_key_exists($oldName, $students_score)) Otherwise, just returns the array unmodified. The following example uses the PHP array_key_exists to see if the key exists in the first. So, let’s cut the loop part and bring down the complexity further. Using a foreach loop is redundant because the array features direct indexing meaning that the array returns values for a given key. #2 – Update key value in array PHP using array_key_exists That’s why using the PHP arsort helps in rearranging the scores. The array elements are placed by order of their insertion. Finally, it sorts the array in descending order using the arsort function.It then removes the old key and value because the array has the updated entry.Once it finds that key it assigns the associated score to the new key.It loops through the array and find the key that equals to the name that’s gonna be replaced.The breakdown of the changeName() in the example is as follows. $students_score = changeName($students_score, 'Jamie', 'James') Unset($students_score) // Removes the old key and value. $students_score = $score // Only the keys are meant to be replaced. 10,įunction changeName($students_score, $oldName, $newName)įoreach($students_score as $student=>$score) The following example will use a foreach loop to change key value in array PHP. PHP foreach loop is convenient because it gives us easy access to key and value pairs. The most obvious approach is using a loop. #1 – Update key value in array PHP using a loop Thus, we can update key value in array PHP, and that’s exactly what this article will focus on. PHP associative arrays are basically hash maps as they include key and value pairs. Though the article includes three approaches, the second approach is the most efficient.
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