php catch exception and continue execution is it possible

Question

Is it possible to catch exception and continue execution of script

User · Answer

Sure   try      throw new Exception  Something bad      catch  Exception  e           Do nothing     You might want to go have a read of the PHP documentation on Exceptions

User · Answer

An old question  but one I had in the past when coming away from VBA scipts to php  where you could us  GoTo  to re-enter a loop  On Error  with a  Resume  and away it went still processing the function  In php  after a bit of trial and error  I now use nested try   catch   for critical versus non critical processes  or even for interdependent class calls so I can trace my way back to the start of the error  e g  if function b is dependant on function a  but function c is a nice to have but should not stop the process  and I still want to know the outcomes of all 3 regardless  here s what I do     set up array to capture output of all 3 functions  resultArr   array array    array    array         Loop through the primary array and run the functions  foreach  x as  key   gt   val        try                resultArr  key  0      a  key             resultArr  key  1      b  val           try              If successful  output of c   is captured              resultArr  key  2      c  key   val                     catch Exception  ex               If an error  capture why c   failed              resultArr  key  2       ex- gt getMessage                        catch Exception  ex           If critical functions a   or b   fail  we catch the reason why          criticalError    ex- gt getMessage               Now I can loop through my result array for each key and assess the outcomes  If there is a critical failure for a   or b    I still have a point of reference on how far it got before a critical failure occurred within the  resultArr and if the exception handler is set correctly  I know if it was a   or b   that failed  If c   fails  loop keeps going  If c   failed at various points  with a bit of extra post loop logic I can even find out if c   worked or had an error on each iteration by interrogating  resultArr  key  2

User · Answer

Another angle on this is returning an Exception  NOT throwing one  from the processing code   I needed to do this with a templating framework I m writing  If the user attempts to access a property that doesn t exist on the data  I return the error from deep within the processing function  rather than throwing it   Then  in the calling code  I can decide whether to throw this returned error  causing the try   to catch    or just continue      process the template     try                  this function will pass back a value  or a TemplateExecption if invalid              result    this- gt process  value               if the result is an error  choose what to do with it             if  result instanceof TemplateExecption                                if DEBUGGING    TRUE                                        throw  result      throw the original error                                   else                                        result   NULL     ignore the error                                           catch TemplateExceptions     catch TemplateException  e                   handle template exceptions           catch normal PHP Exceptions     catch Exception  e                   handle normal exceptions           if we get here   result was valid  or ignored     return  result    The result of this is I still get the context of the original error  even though it was thrown at the top   Another option might be to return a custom NullObject or a UnknownProperty object and compare against that before deciding to trip the catch    but as you can re-throw errors anyway  and if you re fully in control of the overall structure  I think this is a neat way round the issue of not being able to continue try catches

User · Answer

Yes but it depends what you want to execute   E g   try      a       b      catch Exception  e      c      c   will always be executed  But if a   throws an exception  b   is not executed   Only put the stuff in to the try block that is depended on each other  E g  b depends on some result of a it makes no sense to put b after the try-catch block

User · Answer

For PHP 8  we can omit the variable name for a caught exception   catch As of PHP 8 0 0  the variable name for a caught exception is optional  If not specified  the catch block will still execute but will not have access to the thrown object   And thus we can do it like this  try     throw new Exception  quot An error quot      catch  Exception

User · Answer

Yes   try       Somecode    catch  Exception  e           handle or ignore exception here       however note that php also has error codes separate from exceptions  a legacy holdover from before php had oop primitives  Most library builtins still raise error codes  not exceptions  To ignore an error code call the function prefixed with      myfunction

User · Answer

php   7  use the new interface Throwable       try              Code that may throw an Exception or Error        catch  Throwable  t               Handle exception        echo  Script is still running         this script will be executed

User · Answer

Sure  just catch the exception where you want to continue execution       try           SomeOperation          catch  SomeException  e               do nothing    php will ignore and continue           Of course this has the problem of silently dropping what could be a very important error  SomeOperation   may fail causing other subtle  difficult to figure out problems  but you would never know if you silently drop the exception

[php] php: catch exception and continue execution, is it possible?

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