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What does `strlen()` function return in PHP?

The total number of characters including spaces in a string

The length of a string

The `strlen()` function in PHP is used to determine the length of a string. It returns an integer value that represents the number of characters present in that string. This includes all characters such as letters, digits, punctuation, spaces, and any special characters.

For example, if you call `strlen("Hello World")`, it would return `11` since there are 11 characters in that string, including the space between "Hello" and "World".

While the option that mentions the total number of characters including spaces might seem closely related, the primary emphasis here is on accurately defining what `strlen()` specifically returns: the length of a string as a total count of all character elements, which is summarized well in the selected answer. The other options miss the mark in defining the specific functionality of `strlen()`, such as mixing it up with word count or size in bytes, which are handled differently in PHP through other functions.

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The number of words in a string

The total size of a string in bytes

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