php的多分支控制
– 原文 (飞扬轻狂,fallseir) 20090427
==== php的多分支控制 ====
### if 方式 实现多分支控制
if(runStep(1)){
if(runStep(2)){
if(runStep(3)){
# all steps are success!!
}else{
# step 03 is failed!
}
}else{
# step 03 is failed!
}
}else{
# step 03 is failed!
}
# some others steps
### if 方式 2 实现多分支控制
$r=0;
if(runStep(1))
if(runStep(2))
if(runStep(3))
else $r=3;
else $r=2;
else $r=1;
if($r){
# step $r is failed!
return false;
}
# some others steps
### do..while(false) 方式 2 实现多分支控制
do{
if(!runStep(1)) # step 01 is failed!
break;
if(!runStep(2)) # step 02 is failed!
break;
if(!runStep(3)) # step 03 is failed!
break;
# all steps are success!!
}while(false);
# some others steps
### switch(true) 方式 2 实现多分支控制
switch(true){
case !runStep(1):
# step 01 is failed!
break;
case !runStep(2):
# step 02 is failed!
break;
case !runStep(3):
# step 03 is failed!
break;
default:
# all steps are success!!
break;
}
# some others steps
### try..catch 方式实现
try{
if(!runStep(1)) throw new SomeError(1); # step 01 is failed!
if(!runStep(2)) throw new SomeError(2); # step 02 is failed!
if(!runStep(3)) throw new SomeError(3); # step 01 is failed!
# all steps are success!!
}catch(SomeError $ex){
# step $ex is failed!
return false;
}
# some others steps

