使用php替换字符串的第二个逗号 - replace every second comma of string using php

replace every second comma of string using php

我有一个字符串，显示如下:

1235, 3, 1343, 5, 1234, 1

我需要用分号代替第二个逗号

。

1235, 3; 1343, 5; 1234, 1

字符串长度将始终不同，但将遵循与上述相同的模式，即数字，空格，数字，空格等。

如何在PHP中做到这一点?这可能吗?

谢谢。

Preg_replace() solution

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

输出:

1235, 3; 1343, 5; 1234, 1

试试这个:

$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);

试试这个:

<?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;
}
?>

结果:

 1235, 3; 1343, 5; 1234, 1

试试这个:

$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);

输出:

1235, 3; 1343, 5; 1234, 1

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;

试试这个:

<?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;
?>