If you create an associative array and then add a new element without specifying a key, PHP will not assume that the array is indexed.

Name: If you create an associative array and then add a new element without specifying a key, PHP will not assume that the array is indexed.
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When you add a new element to an associative array in PHP without specifying a key, PHP automatically uses the next highest integer key available, effectively treating it as an indexed array for that element.

If You Create an Associative Array and Then Add a New