Question

我试图匹配字符串，但它会进入最后一个其他循环。你能帮忙吗？

$cstg = "<result>True<\/result>";

if (preg_match("/<result>True<\/result>/", $cstg)) {
    echo "result success";
}
else if (preg_match("/\<result\>False\<\/result\>/", $cstg)) {
    echo "result fail";
}
else {
    echo "Something went wrong.";
}

Answer 1

问题来自您的$cstg字符串。你不必在html文本中逃脱\。所以下面的代码工作正常：

$cstg = "<result>True</result>";

if( preg_match("/<result>True<\/result>/", $cstg)){
    echo "result success";
}
elseif  (preg_match("/\<result\>False\<\/result\>/", $cstg)){
    echo "result fail";
}else{
    echo "Something went wrong.";
}

Answer 2

$cstg ="<result>True</result>";
$find="<result>False<\/result>";

if( preg_match("/$find/", $cstg)){
    echo "result success";
}
elseif  (preg_match("/$find/", $cstg)){
    echo "result fail";
}else{
    echo "Something went wrong.";
}

Answer 3

定义'/'时，您无需转义$cstg。当我从$cstg中删除转义时，您的示例正确运行。另外需要指出的是，您不需要在<中转义>和prce_match()。这段代码适合我：

<?php
$cstg = "<result>True</result>";

if (preg_match("/<result>True<\/result>/", $cstg))
{
    echo "result success";
}
elseif  (preg_match("/<result>False<\/result>/", $cstg))
{
    echo "result fail";
}
else
{
    echo "Something went wrong.";
}

您可以看到您将文字'\'放入$cstg，如下所示：

<?php
$cstg = "<result>True<\/result>";
echo $cstg;

输出：

<result>True<\/result>

php正则表达式失败

3 个答案: