Removing last comma from a foreach loop

问题

Im using a foreach loop to echo out some values from my database and seperating each of them by commas but I dont know how to remove the last comma it adds on the last value.

My code is pretty simple but I just cant seem to find the correct way of doing this:

foreach ($this->sinonimo as $s){ 

echo '<span>'.ucfirst($s->sinonimo).',</span>';

}

Thanks in advance for any help :)

回答1:

Put your values in an array and then implode that array with a comma (+ a space to be cleaner):

$myArray = array();
foreach ($this->sinonimo as $s){ 
    $myArray[] = '<span>'.ucfirst($s->sinonimo).'</span>';
}

echo implode( ', ', $myArray );

This will put commas inbetween each value, but not at the end. Also in this case the comma will be outside the span, like:

<span>Text1<span>, <span>Text2<span>, <span>Text3<span>

回答2:

Another approach for your code would be a bit logic:

hasComma = false;
foreach ($this->sinonimo as $s){ 
    if (hasComma){ 
        echo ","; 
    }
    echo '<span>'.ucfirst($s->sinonimo).'</span>';
    hasComma=true;
}

回答3:

I'll generally try to avoid adding logic for such use cases. The best method would be to store the values in an array and implode it with a comma.

However, you can add the commas by CSS which is much easier.

Your nice and clean loop:

foreach($collection->object as $data)
{
    echo "<span>" . $data->var . "</span>";
}

And for the CSS:

.selector span:after {
    content: ",";
}
.selector span:last-child:after {
    content: "";
}

This works for all major browsers including IE8 and newer.

回答4:

Alternatively to @Sébastien's answer, you could do this:

echo "<span>".ucfirst($this->sinonimo[0]);
for($i = 1; $i < count($this->sinonimo); $i++) {
    echo "</span>, <span>" . ucfirst($this->sinonimo[$i]);
}
echo "</span>";

This doesn't need the extra array. It works by first printing the first element, then in the loop printing the intermediate segment followed by the next element, and then closes everything off with the end segment.

回答5:

Laravel has a implode() function same as php implode().

You should use implode() function on Collection object:

$user->posts->implode('title', ', ');

output will be something like this:

Hello world!, First post, Second post

回答6:

u can use trim function. suppose your string is like this

$str=1,2,3,4,5,6,7,8,

u can try this

echo trim($str, ",");

and the output is

1,2,3,4,5,6,7,8

回答7:

use substr() function

Put your final string in substr() function

 $string = "";
    while ($row = mysql_fetch_array($result)) {
      $string .= $name . ', ';
    }
    echo substr($string, 0, strlen($string) - 2);

回答8:

Laravel implode() function for relational data.

Like post has many categories.

$user->posts->implode('categories.name', ', '); // In loop {{  $post->categories->name }}

来源：https://stackoverflow.com/questions/19935405/removing-last-comma-from-a-foreach-loop

标签

php

loops

foreach

comma