How to find how many different numbers?

if
$x[1]=5;
$x[2]=5;
$x[3]=7;
$x[4]=7;
$x[5]=5;
$x[6]=5;
$x[7]=5;
$x[8]=7;

the numbers only 5 & 7
how to echo "2";( it means only 2 kind of nubmers)

 

have a look on array_count_values()

 

<?php

$y = array();

foreach($x as $val)
{
	$y[$val] = true;
}

$uniques = count($y);

unset($y);

?>

PHP:

 

thank you

but i really need $x[x] not array

 

How to works?
i can't understand with it.

 

y is array of unique numbers.

after the foreach loop, the y array should look like this:
Array
(
5=>true,
7=>true
)

so, value of $unique is 2

 

It loops through the source array one time.

During this loop, it creates an array that uses the values of the source array as indexes. Since later occurrences of a value will already have a key in the new array, that existing key will just be overwritten preventing there from being any duplicates.

Since there are no duplicates in the new array, it's safe to do a simple count() to get the unique element count before trashing the new array if there's no further need for it.

 

Any example available?

thank you

 

wow, nearly a perfect description of the buildin array_count_values() php function... Oh.. there is a little difference, the array_count_values() will have the count vor each key as value....

here, this work:

<?php
$x[1]=5;
$x[2]=5;
$x[3]=7;
$x[4]=7;
$x[5]=5;
$x[6]=5;
$x[7]=5;
$x[8]=7;
$y=array_count_values($x);
$xcount= count($y);   # $xcount is now the count of different values in $x
print $xcount;
?>

Code (markup):

 

5.2.9

PHP_FUNCTION(array_count_values)
{
	zval	**input,		/* Input array */
		**entry,		/* An entry in the input array */
		**tmp;
	HashTable *myht;
	HashPosition pos;
	
	/* Get arguments and do error-checking */
	if (ZEND_NUM_ARGS() != 1 || zend_get_parameters_ex(1, &input) == FAILURE) {
		WRONG_PARAM_COUNT;
	}
	
	if (Z_TYPE_PP(input) != IS_ARRAY) {
		php_error_docref(NULL TSRMLS_CC, E_WARNING, "The argument should be an array");
		return;
	}
	
	/* Initialize return array */
	array_init(return_value);

	/* Go through input array and add values to the return array */	
	myht = Z_ARRVAL_PP(input);
	zend_hash_internal_pointer_reset_ex(myht, &pos);
	while (zend_hash_get_current_data_ex(myht, (void **)&entry, &pos) == SUCCESS) {
		if (Z_TYPE_PP(entry) == IS_LONG) {
			if (zend_hash_index_find(Z_ARRVAL_P(return_value), 
									 Z_LVAL_PP(entry), 
									 (void**)&tmp) == FAILURE) {
				zval *data;
				MAKE_STD_ZVAL(data);
				ZVAL_LONG(data, 1);
				zend_hash_index_update(Z_ARRVAL_P(return_value), Z_LVAL_PP(entry), &data, sizeof(data), NULL);
			} else {
				Z_LVAL_PP(tmp)++;
			}
		} else if (Z_TYPE_PP(entry) == IS_STRING) {
			if (zend_symtable_find(Z_ARRVAL_P(return_value), Z_STRVAL_PP(entry), Z_STRLEN_PP(entry) + 1, (void**)&tmp) == FAILURE) {
				zval *data;
				MAKE_STD_ZVAL(data);
				ZVAL_LONG(data, 1);
				zend_symtable_update(Z_ARRVAL_P(return_value), Z_STRVAL_PP(entry), Z_STRLEN_PP(entry) + 1, &data, sizeof(data), NULL);
			} else {
				Z_LVAL_PP(tmp)++;
			}
		} else {
			php_error_docref(NULL TSRMLS_CC, E_WARNING, "Can only count STRING and INTEGER values!");
		}

		zend_hash_move_forward_ex(myht, &pos);
	}
}

Code (markup):

 

Thank you so much for Sudoku-Master and joebert.
helpe me out
my programming able to working fine.

 

find unique numbers using array_unique() function then count using count() function