mike-php at spam dot emerge2 dot spam dot com
23-Aug-2003 06:20
All arrays in PHP are associative arrays, but it is quite easy to treat an
associative array just like it is a sequential array. However, when dealing
with XML-RPC, it is necessary to know whether an array is associative or
sequential, so I created this function.
It isn't perfect, since an
associative array that just happens to have sequential, integer keys
starting with 0 will 'look' exactly like a sequential array, and will fool
this
function.
/****************************************************************
*
is_assoc_array tries to decide whether or not a given array *
* is an
associative array, or a sequential array. Of course, no *
* such
distinction is made by PHP, so it really just tests *
* whether or
not a given array could possibly be a sequential *
* array. Since an
associative array with sequential, integer *
* keys 'looks' just like
a sequential array, this function will *
* be fooled.
*
*
*
* BUG: Associative arrays with sequential,
integer keys 'look' *
* just like sequential arrays, and will be
identified as such. *
*
*
****************************************************************/
function
is_assoc_array( $php_val ) {
if( !is_array( $php_val ) ){
#
Neither an associative, nor non-associative array.
return
false;
}
$given_keys = array_keys( $php_val );
$non_assoc_keys = range( 0, count( $php_val ) );
if(
function_exists( 'array_diff_assoc' ) ) { # PHP > 4.3.0
if(
array_diff_assoc( $given_keys, $non_assoc_keys ) ){
return
true;
}
else {
return false;
}
}
else {
if( array_diff( $given_keys, $non_assoc_keys ) and
array_diff( $non_assoc_keys, $given_keys ) ){
return true;
}
else {
return false;
}
}
}
intval
