How to remove white space or repeating elements from PHP arrays

This article mainly introduces how to remove blank or repetitive elements in PHP array, which is very detailed and has certain reference value. Friends who are interested must read it!

1. Foreach loop + empty () + unset ().

Use the foreach statement to iterate through the array $array, assigning the key name to $key and the key value to $value in each loop.

2. The array_filter () function can use the callback function to filter the elements in the array. This function iterates over each value in the array, passing them to a user-defined function or callback function.

If the callback function is omitted, null values are filtered by default.

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