PHP4 User Manual: function-count

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(PHP 3, PHP 4> = 4.0.0)
Count -- calculates the number of elements in a variable.
Description
 
Int count (mixed var)
 
Returns the number of var elements of a variable. The most representative is an array (other types only have one element ).
If the var variable is not an array, 1 (except: count (NULL) is equivalent to 0) is returned ).
 
Warning
Count () may return 0 for an unspecified variable, but it can also return 0 for an initialized empty array. If you want to check whether a variable is set, use the isset () function.
 
For array implementation and use of PHP in arrays, see the array section in the manual.
Example 1. count ()
$ A [0] = 1;
$ A [1] = 3;
$ A [2] = 5;
$ Result = count ($ );
// $ Result = 3
$ B [0] = 7;
$ B [5] = 9;
$ B [10] = 11;
$ Result = count ($ B );
// $ Result = 3;
 
Note: The sizeof () function is an alias of count ().
See sizeof (), isset (), and is_array ().