02-14-2008
*I understood from the beginning. I said they are not truly contiguous in memory.
Why? they are 20 chars long. 20 % 8 == 4 There are 4 bytes between them. Very probably.
The first position in memory after str1 (str1["21"] which does not really exist) is very likely NOT str2[0].
Why only very likely NOT true?
How things are positioned in memory is implementation dependent. So I cannot guarantee where str1 and str2 live in memory because you may be running a non-standard compiler or running in a special unix environment.
In the environments I do know they will not be back-to-front in memory. There will be a gap. Why don't you just modify my code and see?
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LEARN ABOUT PHP
array_combine
ARRAY_COMBINE(3) 1 ARRAY_COMBINE(3)
array_combine - Creates an array by using one array for keys and another for its values
SYNOPSIS
array array_combine (array $keys, array $values)
DESCRIPTION
Creates an array by using the values from the $keys array as keys and the values from the $values array as the corresponding values.
PARAMETERS
o $keys
- Array of keys to be used. Illegal values for key will be converted to string.
o $values
- Array of values to be used
RETURN VALUES
Returns the combined array, FALSE if the number of elements for each array isn't equal.
ERRORS
/EXCEPTIONS
Throws E_WARNING if the number of elements in $keys and $values does not match.
CHANGELOG
+--------+---------------------------------------------------+
|Version | |
| | |
| | Description |
| | |
+--------+---------------------------------------------------+
| 5.4.0 | |
| | |
| | Previous versions issued E_WARNING and returned |
| | FALSE for empty arrays. |
| | |
+--------+---------------------------------------------------+
EXAMPLES
Example #1
A simple array_combine(3) example
<?php
$a = array('green', 'red', 'yellow');
$b = array('avocado', 'apple', 'banana');
$c = array_combine($a, $b);
print_r($c);
?>
The above example will output:
Array
(
[green] => avocado
[red] => apple
[yellow] => banana
)
SEE ALSO
array_merge(3), array_walk(3), array_values(3).
PHP Documentation Group ARRAY_COMBINE(3)