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Common PHP exception handling methods

Jun 09, 2018 pm 02:01 PM
phpException handling

This article mainly introduces common PHP exception handling methods. Interested friends can refer to it. I hope it will be helpful to everyone.

The example of this article describes the PHP exception handling method, as follows:

<?php 
$path = "D://in.txt"; 
try //检测异常 
{ 
  file_open($path); 
} 
catch(Exception $e) //捕获异常 
{ 
  echo $e->getMessage(); 
} 
 
function file_open($path) 
{ 
  if(!file_exists($path))
  //如果文件无法找到,抛出异常对象 
  { 
    throw new Exception("文件无法找到", 1); 
  } 
  if(!fopen($path, "r"))
  //如果文件无法打开,抛出异常对象 
  { 
    throw new Exception("文件无法打开", 2); 
  } 
} 
?>
<?php 
$path = "D://in.txt";
//文件所在路径 
file_open($path);
//调用file_open函数 
 
function file_open($path) 
{ 
  if(!file_exists($path))
  //如果文件无法找到,抛出异常对象 
  { 
    throw new Exception("文件无法找到", 1); 
  } 
  if(!fopen($path, "r"))
  //如果文件无法打开,抛出异常对象 
  { 
    throw new Exception("文件无法打开", 2); 
  } 
} 
?>
<?php 
function exception_handler($e)
//用于处理异常的函数 
{ 
 echo "未捕获的异常:".$e->getMessage(); 
} 
 
set_exception_handler("exception_handler");
//设置异常处理函数 
try //检测异常 
{ 
  $path = "D://in.txt"; 
} 
catch(Exception $e) //捕获异常 
{ 
  echo $e->getMessage(); 
} 
file_open($path); //调用函数打开文件 
function file_open($path) 
{ 
  if(!file_exists($path))
  //如果文件无法找到,抛出异常对象 
  { 
    throw new Exception("文件无法找到", 1); 
  } 
  if(!fopen($path, "r"))
  //如果文件无法打开,抛出异常对象 
  { 
    throw new Exception("文件无法打开", 2); 
  } 
} 
?>
<?php 
$path = "D://in.txt"; 
 
try 
{ 
  file_open($path); //尝试打开文件 
} 
catch(Exception $e) 
{ 
  echo "异常信息:".$e->getMessage()."/n";
  //返回用户自定义的异常信息 
  echo "异常代码:".$e->getCode()."/n";
  //返回用户自定义的异常代码 
  echo "文件名:".$e->getFile()."/n";
  //返回发生异常的PHP程序文件名 
  echo "异常代码所在行".$e->getLine()."/n";
  //返回发生异常的代码所在行的行号 
  echo "传递路线:"; 
  print_r($e->getTrace());
  //以数组形式返回跟踪异常每一步传递的路线 
  echo $e->getTraceAsString();
  //返回格式化成字符串的getTrace函数信息 
} 
function file_open($path) 
{ 
  if(!file_exists($path))
  //如果文件不存在,则抛出错误 
  { 
    throw new Exception("文件无法找到", 1); 
  } 
   
  if(!fopen($path, "r")) 
  { 
    throw new Exception("文件无法打开", 2); 
  } 
} 
?>
<?php 
class FileExistsException extends Exception{}
//用于处理文件不存在异常的类 
class FileOpenException extends Exception{}
//用于处理文件不可读异常的类 
$path = "D://in.txt"; 
try 
{ 
  file_open($path); 
} 
catch(FileExistsException $e)
//如果产生FileExistsException异常则提示用户确认文件位置 
{ 
  echo "程序在运行过程中发生了异常:".$e->getMessage()."/n"; 
  echo "请确认文件位置。"; 
} 
catch(FileOpenException $e)
//如果产生FileOpenException异常则提示用户确认文件的可读性 
{ 
  echo "程序在运行过程中发生了异常:".$e->getMessage()."/n"; 
  echo "请确认文件的可读性。"; 
} 
catch(Exception $e) 
{ 
  echo "[未知异常]"; 
  echo "异常信息:".$e->getMessage()."/n";
  //返回用户自定义的异常信息 
  echo "异常代码:".$e->getCode()."/n";
  //返回用户自定义的异常代码 
  echo "文件名:".$e->getFile()."/n";
  //返回发生异常的PHP程序文件名 
  echo "异常代码所在行".$e->getLine()."/n";
  //返回发生异常的代码所在行的行号 
  echo "传递路线:"; 
  print_r($e->getTrace());
  //以数组形式返回跟踪异常每一步传递的路线 
  echo $e->getTraceAsString();
  //返回格式化成字符串的getTrace函数信息 
} 
function file_open($path) 
{ 
  if(!file_exists($path)) 
  { 
    throw new FileExistsException("文件无法找到", 1);
    //抛出FileExistsException异常对象 
  } 
   
  if(!fopen($path, "r")) 
  { 
    throw new FileOpenException("文件无法打开", 2);
    //抛出FileOpenException异常对象 
 
  } 
} 
?>
<?php 
class FileExistsException extends Exception{}
//用于处理文件不存在异常的类 
class FileOpenException extends Exception{}
//用于处理文件不可读异常的类 
$path = "D://in.txt"; 
try 
{ 
  file_open($path); //尝试打开文件 
} 
catch(Exception $e) 
{ 
  echo "[未知异常]"; 
  echo "异常信息:".$e->getMessage()."/n";
  //返回用户自定义的异常信息 
  echo "异常代码:".$e->getCode()."/n";
  //返回用户自定义的异常代码 
  echo "文件名:".$e->getFile()."/n";
  //返回发生异常的PHP程序文件名 
  echo "异常代码所在行".$e->getLine()."/n";
  //返回发生异常的代码所在行的行号 
  echo "传递路线:"; 
  print_r($e->getTrace());
  //以数组形式返回跟踪异常每一步传递的路线 
  echo $e->getTraceAsString();
  //返回格式化成字符串的getTrace函数信息 
} 
catch(FileExistsException $e)
//如果产生FileExistsException异常则提示用户确认文件位置 
{ 
  echo "程序在运行过程中发生了异常:".$e->getMessage()."/n"; 
  echo "请确认文件位置。"; 
} 
catch(FileOpenException $e)
//如果产生FileOpenException异常则提示用户确认文件的可读性 
{ 
  echo "程序在运行过程中发生了异常:".$e->getMessage()."/n"; 
  echo "请确认文件的可读性。"; 
} 
function file_open($path) 
{ 
  if(!file_exists($path))
  //如果文件不存在,则输出错误 
  { 
    throw new FileExistsException("文件无法找到", 1); 
  } 
   
  if(!fopen($path, "r")) 
  { 
    throw new FileOpenException("文件无法打开", 2); 
  } 
} 
?>
<?php 
class FileExistsException extends Exception{}
//用于处理文件不存在异常的类 
class FileOpenException extends Exception{}
//用于处理文件不可读异常的类 
$path = "D://in.txt"; 
try 
{ 
  file_open($path); 
} 
catch(FileExistsException $e)
//如果产生FileExistsException异常则提示用户确认文件位置 
{ 
  echo "程序在运行过程中发生了异常:".$e->getMessage()."/n"; 
  echo "请确认文件位置。"; 
} 
catch(FileOpenException $e)
//如果产生FileOpenException异常则提示用户确认文件的可读性 
{ 
  echo "程序在运行过程中发生了异常:".$e->getMessage()."/n"; 
  echo "请确认文件的可读性。"; 
} 
catch(Exception $e) 
{ 
  echo "[未知异常]"; 
  echo "异常信息:".$e->getMessage()."/n";
  //返回用户自定义的异常信息 
  echo "异常代码:".$e->getCode()."/n";
  //返回用户自定义的异常代码 
  echo "文件名:".$e->getFile()."/n";
  //返回发生异常的PHP程序文件名 
  echo "异常代码所在行".$e->getLine()."/n";
  //返回发生异常的代码所在行的行号 
  echo "传递路线:"; 
  print_r($e->getTrace());
  //以数组形式返回跟踪异常每一步传递的路线 
  echo $e->getTraceAsString();
  //返回格式化成字符串的getTrace函数信息 
} 
function file_open($path) 
{ 
  try 
  { 
    if(!file_exists($path)) 
    { 
      throw new FileExistsException("文件无法找到", 1); 
    } 
     
    if(!fopen($path, "r")) 
    { 
      throw new FileOpenException("文件无法打开", 2); 
    } 
  } 
  catch(Exception $e)               //捕获异常 
  { 
    echo "file_open函数在运行过程中出现异常"; 
    throw $e;                  //重掷异常 
  } 
} 
?>

Summary: The above is the entire content of this article, I hope it can be useful for everyone's learning help.

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