CODEWITHSUNDEEP
phparrays
Akash Saraswat
Akash Saraswat

Reputation: 3

count() returning wrong value

I am using the following code:

$row_arr=$_POST['row_driver'];
print_r($row_arr);

returns:

Array ( [0] => d1 [1] => d2 [2] => d3 [3] => d5 )

but

echo count($row_arr);

is returning me a value of

1

Any reason why?

Here row_driver is an array being received through a form from a previous PHP page using hidden element property of HTML form. Also,

foreach($row_arr as $driver)
{
//code here
}

is returning:

Warning: Invalid argument supplied for foreach() in D:\XAMPP\htdocs\Carpool\booking_feed.php on line 36

Upvotes: 0

Views: 1540

Answers (4)

Webdev
Webdev

Reputation: 647

The problem lies with the hidden field

foreach ($rows as $value){
<input type="hidden" name="row_driver[]" value="<?php echo $value; ?>">
}

Upvotes: 0

Blasanka
Blasanka

Reputation: 22427

PHP document:

expression

The expression to be printed. return

If you would like to capture the output of print_r(), use the return parameter. When this parameter is set to TRUE, print_r() will

return the information rather than print it.

Return Values

If given a string, integer or float, the value itself will be printed. If given an array, values will be presented in a format that shows keys and elements. Similar notation is used for objects.

When the return parameter is TRUE, this function will return a string. Otherwise, the return value is TRUE.

print_r() can use as special printing method to display all values in arrays and for associative arrays(more helpful for this).

Associative array:

Associative arrays are arrays that use named keys that you assign to them.

If you use echo you have print it with a array index. As a example $row_arr[0] or if you use for associative array instead of index, key is used. it may be string.

Upvotes: 0

Gaurang Sondagar
Gaurang Sondagar

Reputation: 311

You might just store the count value in some variable :

$row_arr=Array('d1','d2','d3','d4');
print_r($row_arr);

$count = count($row_arr);
echo 'Your Count is:- '.$count;

Upvotes: 1

JustBaron
JustBaron

Reputation: 2347

The issue you are facing is with the fact that $_POST['row_driver'] is not an array.

If you have one hidden HTML input:

<input type="hidden" name="row_driver" value="<?php print_r($rows); ?>">

...then $_POST['row_driver'] would be a string, e.g.:

$_POST['row_driver'] = "Array ( [0] => d1 [1] => d2 [2] => d3 [3] => d5 )";

, and therefore, your count() function results in 1.

This would also explain the second issue you are facing, with foreach(), where the function expects an array, but you are providing a string.

A solution would be to use a foreach loop for your hidden HTML inputs like this: 

<?php foreach($rows as $row_driver){?>
    <input type="hidden" name="row_driver[]" value="<?php echo $row_driver; ?>"/>
<?php }?>

This would then turn your $_POST['row_driver'] into an array.

Upvotes: 1

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