rtrim Not trimming =(...

[bluegray]

So I'm trying to create a function that builds a string from an array and removes that comma/space on the last element.  When examining the output however, comma and space are still there.  Help please?

 

var_dump($data) ;
//$element_count = count ($data) ; 

foreach ($data as $ky) { 
	$key = key ($data) ; ?> 
	<p> This is the current key: <?php echo $key ;
	$keys = "$keys" . "$key, " ;
	next ($data) ;
   	?> 
	</p> <?php 
}
rtrim ("$keys", ", ") ;
	echo "\"" . $keys . "\"" ;

 

 

[kenrbnsn]

Instead of doing it that way, store the keys in a temporary array and then implode the array using a comma as the separator.

 

<?php
        $tmp = array();
foreach ($data as $ky) { 
	$key = key ($data) ; 
	echo "<p> This is the current key:  $key </p>";
	$tmp[] =  $key;
}
        $keys = implode(',',$tmp);
?>

 

Ken

[shino]

You can use array_keys();

http://php.net/manual/en/function.array-keys.php

 

$keys = implode(',',array_keys($data));

[bluegray]

Instead of doing it that way, store the keys in a temporary array and then implode the array using a comma as the separator.

 

<?php
        $tmp = array();
foreach ($data as $ky) { 
	$key = key ($data) ; 
	echo "<p> This is the current key:  $key </p>";
	$tmp[] =  $key;
}
        $keys = implode(',',$tmp);
?>

 

Ken

 

Sweet, that worked, thanks!  But do you know why the rtrim was failing?

[PFMaBiSmAd]

rtrim() (and most php functions) RETURN the value they produce. You are not assigning that value to $keys, so, $keys simply has the original value in it.

[bluegray]

You can use array_keys();

http://php.net/manual/en/function.array-keys.php

 

$keys = implode(',',array_keys($data));

 

Cool!  Learned a new function.  Thanks!

[bluegray]

rtrim() (and most php functions) RETURN the value they produce. You are not assigning that value to $keys, so, $keys simply has the original value in it.

 

Bingo!  Thank you!