replace every second comma of string using php

问题:

I have a string of that displays like this:

1235, 3, 1343, 5, 1234, 1

I need to replace every second comma with a semicolon

i.e.

1235, 3; 1343, 5; 1234, 1

The string length will always be different but will follow the same pattern as the above i.e. digits comma space digits comma space, etc.

How can I do this with PHP? Is it possible?

Thanks.

回答1:

Try this :

$str     = '1235, 3, 1343, 5, 1234, 1';
$res_str = array_chunk(explode(",",$str),2);
foreach( $res_str as &$val){
   $val  = implode(",",$val);
}
echo implode(";",$res_str);

回答2:

Preg_replace() solution

$str = '1235, 3, 1343, 5, 1234, 1';
$str = preg_replace('/(.+?),(.+?),/', '$1,$2;', $str);
echo $str;

Output:

1235, 3; 1343, 5; 1234, 1

回答3:

Try this:

<?php
$string =  '1235, 3, 1343, 5, 1234, 1';

var_dump(nth_replace($string, ',', ';', 2));

// replace all occurences of a single character with another character
function nth_replace($string, $find, $replace, $n) {
        $count = 0;
        for($i=0; $i<strlen($string); $i++) {
                if($string[$i] == $find) {
                        $count++;
                }
                if($count == $n) {
                        $string[$i] = $replace;
                        $count = 0;
                }
        }
        return $string;
}
?>

Result:

 1235, 3; 1343, 5; 1234, 1 

回答4:

Try this:

$s = "1235, 3, 1343, 5, 1234, 1";
$pcs = explode(',', $s);

$flag = false;
$res = '';
foreach ($pcs as $item) {
    if (!empty($res)) {
        $res .= $flag ? ',' : ';';
    }
    $flag = !$flag;
    $res .= $item;
}
die($res);

It outputs:

1235, 3; 1343, 5; 1234, 1

回答5:

try this:

$s = '1235, 3, 1343, 5, 1234, 1';
$is_second = false;
for ($i = 0; $i < strlen($s); $i++) {
    if ($is_second && $s[$i] == ',') {
        $s[$i] = ';';
    } elseif ($s[$i] == ',') {
        $is_second = true;
    }
}
echo $s;

回答6:

u may try like this

<?php
$str="1235, 3, 1343, 5, 1234, 1";
$data=explode(',',$str);
$counter=0;
$new_str="";
foreach($data as $key=>$val)
{
  if($counter%2==0)$symbol=',';
  else $symbol=';';
  $new_str .= $val.$symbol; 
 $counter++;
}
echo $new_str;
//output::1235, 3; 1343, 5; 1234, 1;
?>