PHP4 User Manual: function-count. Count (PHP3, PHP44.0.0) count -- count the number of elements in the variable description intcount (mixedvar) returns the number of var elements. the most representative is the count of the website construction server script.
(PHP 3, PHP 4> = 4.0.0) count -- calculate the number of elements in a variable.
Int count (mixed var)
Returns the number of var elements. the most representative is an array of fancylanguage.types.array.html> in the script class of the website construction server ).
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 () example $ 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 ().
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