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Often confused by the character functions of arrays and strings in php, here's a summary:

Strlen ($string) function: calculates the length of a string

Sizeof ($string,$mode) function: it is an alias for the count () function, and the count () function is as follows:

Int count (mixed var [, int mode])

Returns the number of cells in the var, usually an array, and any other type has only one cell.

For objects, if SPL is installed, you can call count () by implementing the Countable interface. The interface has only one method, count (), which returns the return value of the count () function.

If var is not an array type or an object that implements the Countable interface, 1 is returned, with one exception, if var is NULL, the result is 0.

Note: optional mode parameters are available since PHP 4.2.0.

If the optional mode parameter is set to COUNT_RECURSIVE (or 1), count () will count the array recursively. It is especially useful for calculating all elements of a multidimensional array. The default value for mode is 0. Count () does not recognize infinite recursion.

In short, use strlen () for strings and sizeof () for arrays.

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