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Top Forums Programming sizeof an array of structure without using 'sizeof' operator Post 302302234 by rvan on Monday 30th of March 2009 12:17:35 PM
Old 03-30-2009
Thank you pshaikh. it exactly gives the sizeof the structure. While executing your first sample piece of code... it is mostly &begin is greater than &end. Here all the local variables begin, end and array[100] gets stored in the stack. When you subtract the begin address and end address and divide it by the sizeof the array it gives the sizeof structure.

But if i try to subtract address of say &array[1] - &array[0] doesn't give the sizeof the array instead it gives 1 always. I just tried printing &array[1] and &array[0] which gives the address. When we subtract the address of begin and end variable it gives the number of bytes occupied between those two and why not in &array[1] - &array[0]. Kindly clarify.


Thanks
 

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ARRAY_PUSH(3)								 1							     ARRAY_PUSH(3)

array_push - Push one or more elements onto the end of array

SYNOPSIS
int array_push (array &$array, mixed $value1, [mixed $...]) DESCRIPTION
array_push(3) treats $array as a stack, and pushes the passed variables onto the end of $array. The length of $array increases by the num- ber of variables pushed. Has the same effect as: <?php $array[] = $var; ?> Note If you use array_push(3) to add one element to the array it's better to use $array[] = because in that way there is no overhead of calling a function. Note array_push(3) will raise a warning if the first argument is not an array. This differs from the $var[] behaviour where a new array is created. PARAMETERS
o $array - The input array. o $value1 - The first value to push onto the end of the $array. RETURN VALUES
Returns the new number of elements in the array. EXAMPLES
Example #1 array_push(3) example <?php $stack = array("orange", "banana"); array_push($stack, "apple", "raspberry"); print_r($stack); ?> The above example will output: Array ( [0] => orange [1] => banana [2] => apple [3] => raspberry ) SEE ALSO
array_pop(3), array_shift(3), array_unshift(3). PHP Documentation Group ARRAY_PUSH(3)
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