Replace the last comma with an & sign

问题

I have searched everywhere but can't find a solution that works for me.

I have the following:

$bedroom_array = array($studio, $one_bed, $two_bed, $three_bed, $four_bed);

For this example lets say:

$studio = '1';
$one_bed = '3';
$two_bed = '3';

I then use the implode function to put a comma in between all the values:

$bedroom_list = implode(", ", array_filter($bedroom_array));
echo $bedroom_list;

This then outputs:

1, 2, 3

What I want to do is find the last comma in the string and replace it with an &, so it would read:

1, 2 & 3

The string will not always be this long, it can be shorter or longer, e.g. 1, 2, 3, 4 and so on. I have looked into using substr but am not sure if this will work for what I need?

回答1:

Pop off the last element, implode the rest together then stick the last one back on.

$bedroom_array = array('studio', 'one_bed', 'two_bed', 'three_bed', 'four_bed');
$last = array_pop($bedroom_array);
$string = count($bedroom_array) ? implode(", ", $bedroom_array) . " & " . $last : $last;

Convert & to the entity & if necessary.

回答2:

if you have comma separated list of words you may use:

$keyword = "hello, sadasd, sdfgdsfg,sadfsdafsfd, ssdf, sdgdfg";
$keyword = preg_replace('/,([^,]*)$/', ' & \1', $keyword);
echo $keyword;

it will output: hello, sadasd, sdfgdsfg,sadfsdafsfd, ssdf & sdgdfg

回答3:

A one-liner alternative, that will work for any size array ($b = $bedroom_array):

echo count($b) <= 1 ? reset($b) : join(', ', array_slice($b, 0, -1)) . " & " . end($b); 

回答4:

function fancy_implode($arr){
    array_push($arr, implode(' and ', array_splice($arr, -2)));
    return implode(', ', $arr);
}

I find this easier to read/understand and use

• Does not modify the original array
• Does not use regular expressions as those may fail if strings in the array contain commas, there could be a valid reason for that, something like this: array('Shirts (S, M, L)', 'Pants (72 x 37, 72 x 39)');
• Delimiters don't have to be of the same length as with some of the other solutions

回答5:

$bedroom_list = implode(", ", array_filter($bedroom_array));

$vars =  $bedroom_list;

$last = strrchr($vars,",");

$last_ = str_replace(",","&",$last);

echo str_replace("$last","$last_",$vars);

回答6:

<?php
$string = "3, 4, 5";
echo $string = preg_replace('/,( \d)$/', ' &\1', $string);
?>

回答7:

strrpos finds the last occurrance of a specified string. $str = '1, 2, 3';

$index = strrpos( $str, ',' ); 
if( $index !== FALSE )
    $str[ $index ] = '&'; 

来源：https://stackoverflow.com/questions/7687665/replace-the-last-comma-with-an-sign