The is_associative_array() and is_sequential_array() functions posted by 'rjg4013 at rit dot edu' are not accurate.
The functions fail to recognize indexes that are not in sequence or in order. For example, array(0=>'a', 2=>'b', 1=>'c') and array(0=>'a', 3=>'b', 5=>'c') would be considered as sequential arrays. A true sequential array would be in consecutive order with no gaps in the indices.
The following solution utilizes the array_merge properties. If only one array is given and the array is numerically indexed, the keys get re-indexed in a continuous way. The result must match the array passed to it in order to truly be a numerically indexed (sequential) array. Otherwise it can be assumed to be an associative array (something unobtainable in languages such as C).
The following functions will work for PHP >= 4.
<?php
an>implode( array_keys( $var ) ) ) );
}
function is_assoc_array($var)
{
return (array_merge($var) !== $var || !is_numeric( implode( array_keys( $var ) ) ) );
}
?>
If you are not concerned about the actual order of the indices, you can change the comparison to == and != respectively.
php.net
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.
bsp;*
* *
****************************************************************/
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;
}
}
}
www.navioo.com
The is_associative_array() and is_sequential_array() functions posted by 'rjg4013 at rit dot edu' are not accurate.
The functions fail to recognize indexes that are not in sequence or in order. For example, array(0=>'a', 2=>'b', 1=>'c') and array(0=>'a', 3=>'b', 5=>'c') would be considered as sequential arrays. A true sequential array would be in consecutive order with no gaps in the indices.
The following solution utilizes the array_merge properties. If only one array is given and the array is numerically indexed, the keys get re-indexed in a continuous way. The result must match the array passed to it in order to truly be a numerically indexed (sequential) array. Otherwise it can be assumed to be an associative array (something unobtainable in languages such as C).
The following functions will work for PHP >= 4.
<?php
function <.
fault">implode( array_keys( $var ) ) ) );
}
function is_assoc_array($var)
{
return (array_merge($var) !== $var || !is_numeric( implode( array_keys( $var ) ) ) );
}
?>
If you are not concerned about the actual order of the indices, you can change the comparison to == and != respectively.
mirrors.segmentfault.com
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. &n.
nbsp; *
****************************************************************/
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;
}
}
}
php.svchat.ru
