“递归地”更改字符串在 PHP 中
我想使用多个条件来更改字符串（在 PHP 中）来定义应进行哪些更改、更新字符串并继续更改更新后的字符串。
例如，从一个字符串开始，根据一个条件，对字符进行更改，然后使用该字符串的第二个版本，并根据另一个条件，再更改一些，依此类推，这样在过程结束时，变化已经累积。
显然，变量作用域阻止了以下方法：
$newstring = "This is a test string";
$value[] // This is an array already defined.
for ($i = 0; $i<=count($value); $i++) {
switch ($value[$i]) {
case -1:
$newstring = preg_replace(// do something with $newstring);
break;
case 0:
$newstring = preg_replace ( // do something else with $newstring);
break;
case 1:
$newstring = substr_replace(//do something else with $newstring);
break;
}
}
有没有办法实现这一点？
提前致谢。
更新：这是我的代码。正如您所料，$_POST['text1'] 是一个字符串，$_POST['array'] 是一个二维数组。
$text1 = $_POST['text1'];
$value = $_POST['array'];
for ($i = 0; $i<=count($value); $i++) {
switch ($value[$i][0]) {
case -1:
$newstring = preg_replace("/".$value[$i][1]."/","",$text1,1);
break;
case 0:
break;
case 1:
$newstring = substr_replace($text1, $value[$i][1],$value[$i][2],0);
break;
}
}
I want to change a string (in PHP) using several conditionals to define which change should be made, update the string and keep changing the updated string.
For example, start with a string and based on a condition, make a change in the character, then use the second version of the string, and based on another condition, change it some more, and so on, in such a way that at the end of the process, the changes have been cumulative.
Apparently, variable scope prevents the following approach:
$newstring = "This is a test string";
$value[] // This is an array already defined.
for ($i = 0; $i<=count($value); $i++) {
switch ($value[$i]) {
case -1:
$newstring = preg_replace(// do something with $newstring);
break;
case 0:
$newstring = preg_replace ( // do something else with $newstring);
break;
case 1:
$newstring = substr_replace(//do something else with $newstring);
break;
}
}
Is there a way to accomplish this?
Thanks in advance.
UPDATE: Here is my code. As you can expect, $_POST['text1'] is a string and $_POST['array'] is a two dimensional array.
$text1 = $_POST['text1'];
$value = $_POST['array'];
for ($i = 0; $i<=count($value); $i++) {
switch ($value[$i][0]) {
case -1:
$newstring = preg_replace("/".$value[$i][1]."/","",$text1,1);
break;
case 0:
break;
case 1:
$newstring = substr_replace($text1, $value[$i][1],$value[$i][2],0);
break;
}
}
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您将通过每次替换 text1 上的文本来覆盖对 newstring 的更改。您需要通过在各处使用 newstring 来保留这些更改。
You are overwriting your changes to newstring, by replacing text on text1 everytime. You need to preserve those changes by using newstring everywhere.