Any way to break if statement in PHP?
PhpPhp Problem Overview
Is there any command in PHP to stop executing the current or parent if statement, same as break or break(1) for switch/loop. For example
$arr=array('a','b');
foreach($arr as $val)
{
break;
echo "test";
}
echo "finish";
in the above code PHP will not do echo "test"; and will go to echo "finish";
I need this for if
$a="test";
if("test"==$a)
{
break;
echo "yes"; // I don't want this line or lines after to be executed, without using another if
}
echo "finish";
I want to break the if statement above and stop executing echo "yes"; or such codes which are no longer necessary to be executed, there may be or may not be an additional condition, is there way to do this?
Update: Just 2 years after posting this question, I grew up, I learnt how code can be written in small chunks, why nested if's can be a code smell and how to avoid such problems in the first place by writing manageable, small functions.
Php Solutions
Solution 1 - Php
Don't worry about other users comments, I can understand you, SOMETIMES when developing this "fancy" things are required. If we can break an if, a lot of nested ifs won't be necessary, making the code much more clean and aesthetic.
This sample code illustrate that CERTAINS SITUATIONS where breaked if can be much more suitable than a lot of ugly nested ifs... if you haven't faced that certain situation does not mean it doesn't exists.
Ugly code
if(process_x()) {
/* do a lot of other things */
if(process_y()) {
/* do a lot of other things */
if(process_z()) {
/* do a lot of other things */
/* SUCCESS */
}
else {
clean_all_processes();
}
}
else {
clean_all_processes();
}
}
else {
clean_all_processes();
}
Good looking code
do {
if( !process_x() )
{ clean_all_processes(); break; }
/* do a lot of other things */
if( !process_y() )
{ clean_all_processes(); break; }
/* do a lot of other things */
if( !process_z() )
{ clean_all_processes(); break; }
/* do a lot of other things */
/* SUCCESS */
} while (0);
As @NiematojakTomasz says, the use of goto is an alternative, the bad thing about this is you always need to define the label (point target).
Solution 2 - Php
Encapsulate your code in a function. You can stop executing a function with return at any time.
Solution 3 - Php
proper way to do this :
try{
if( !process_x() ){
throw new Exception('process_x failed');
}
/* do a lot of other things */
if( !process_y() ){
throw new Exception('process_y failed');
}
/* do a lot of other things */
if( !process_z() ){
throw new Exception('process_z failed');
}
/* do a lot of other things */
/* SUCCESS */
}catch(Exception $ex){
clean_all_processes();
}
After reading some of the comments, I realized that exception handling doesn't always makes sense for normal flow control. For normal control flow it is better to use "If else":
try{
if( process_x() && process_y() && process_z() ) {
// all processes successful
// do something
} else {
//one of the processes failed
clean_all_processes();
}
}catch(Exception ex){
// one of the processes raised an exception
clean_all_processes();
}
You can also save the process return values in variables and then check in the failure/exception blocks which process has failed.
Solution 4 - Php
Because you can break out of a do/while loop, let us "do" one round. With a while(false) at the end, the condition is never true and will not repeat, again.
do
{
$subjectText = trim(filter_input(INPUT_POST, 'subject'));
if(!$subjectText)
{
$smallInfo = 'Please give a subject.';
break;
}
$messageText = trim(filter_input(INPUT_POST, 'message'));
if(!$messageText)
{
$smallInfo = 'Please supply a message.';
break;
}
} while(false);
Solution 5 - Php
goto: > The goto operator can be used to jump to another section in the program. The target point is specified by a label followed by a colon, and the instruction is given as goto followed by the desired target label. This is not a full unrestricted goto. The target label must be within the same file and context, meaning that you cannot jump out of a function or method, nor can you jump into one. You also cannot jump into any sort of loop or switch structure. You may jump out of these, and a common use is to use a goto in place of a multi-level break...
Solution 6 - Php
There exist command: goto
if(smth) {
.....
.....
.....
.....
.....
goto My123;
.....
.....
}
My123:
....your code here....
BUT REMEMBER! goto should not be ever used anywhere in real-world scripts, as it is a sign of poor code.
Solution 7 - Php
You could use a do-while(false):
<?php
do if ($foo)
{
// Do something first...
// Shall we continue with this block, or exit now?
if ($abort_if_block) break;
// Continue doing something...
} while (false);
?>
as described in http://php.net/manual/en/control-structures.if.php#90073
Solution 8 - Php
No, there is no way to "break" an if block like you would inside loops.:(
So turn your test into a switch !
I wonder why nobody encouraged you to use switch statement since (even if you haven't to many test cases)
Do you think it's too verbose?
I would definitely go for it here
switch($a){
case 'test':
# do stuff here ...
if(/* Reason why you may break */){
break; # this will prevent executing "echo 'yes';" statement
}
echo 'yes'; # ...
break; # As one may already know, we might always have to break at the end of case to prevent executing following cases instructions.
# default:
# something else here ..
# break;
}
To me Exceptions are meant to raise errors and not really to control execution flaw.
If the break behaviour you are trying to set is not about unexpected error(s), Exception handling is not the right solution here :/.
Solution 9 - Php
$a = 1;
switch($a) {
case "1":
if ($condition1){
break;
}
if ($condition2){
break;
}
if ($condition3){
break;
}
}
In this way I got what I want. I use a switch only has a definite case and then use break in case to choose if condition. The reason why I use the break : condition1 and condition2 may both satisfy, in that situation only condition1 is applied .IF is selective according the order.
Solution 10 - Php
No.
But how about:
$a="test";
if("test"==$a)
{
if ($someOtherCondition)
{
echo "yes";
}
}
echo "finish";
Solution 11 - Php
Just move the code that is not supposed to be executed to else/elseif branch. I don't really see why would you want to do what you're trying to do.
Solution 12 - Php
The simple answer is that no, there isn't a way to break from an if statement without completely stopping the execution (via exit). Other solutions won't work for me because I can't change the structure of the if statement, since I'm injecting code into a plugin, like so:
if ( condition ) {
// Code and variables I want to use
// Code I have control over
// Code I don't want to run
}
// More code I want to use
Solution 13 - Php
I had the same problem. A solution is to pile if. The first example is simplistic but...
$a="test";
if("test"==$a)
{
do something
//break; We remove from your example
if(comparison) {
echo "yes";
}
}
echo "finish";
Or, you can use goto.
$a="test";
if("test"==$a)
{
do something
goto the_end_of_your_func;
echo "yes";
}
the_end_of_your_func:
echo "finish";
Solution 14 - Php
Answering to your question whether that is achievable or not, then yes that is achievable using "goto" operator of php.
But ethically, its not a good practice to use "goto" and of there is any need to use goto then this means that code need to be reconstructed such that requirement of goto can be removed.
According to the sample code you posted above, it can be clearly seen that the code can be reconstructed and the code that is no more required can be either deleted or commented (if possibility is there for use in future).
Solution 15 - Php
$arr=array('test','go for it');
$a='test';
foreach($arr as $val){
$output = 'test';
if($val === $a) $output = "";
echo $output;
}
echo "finish";
combining your statements, i think this would give you your wished result. clean and simple, without having too much statements.
for the ugly and good looking code, my recomandation would be:
function myfunction(){
if( !process_x() || !process_y() || !process_z()) {
clean_all_processes();
return;
}
/*do all the stuff you need to do*/
}
somewhere in your normal code
myfunction();
Solution 16 - Php
You could possibly put the if into a foreach a for, a while or a switch like this
Then break and continue statements will be available
foreach ([1] as $i) if ($condition) { // Breakable if
//some code
$a = "b";
// Le break
break;
// code below will not be executed
}
for ($i=0; $i < 1 ; $i++) if ($condition) {
//some code
$a = "b";
// Le break
break;
// code below will not be executed
}
switch(0){ case 0: if($condition){
//some code
$a = "b";
// Le break
break;
// code below will not be executed
}}
while(!$a&&$a=1) if ($condition) {
//some code
$a = "b";
// Le break
break;
// code below will not be executed
}
Solution 17 - Php
i have a simple solution without lot of changes. the initial statement is
> I want to break the if statement above and stop executing echo "yes"; or such codes which are no longer necessary to be executed, there may be or may not be an additional condition, is there way to do this?
so, it seem simple. try code like this.
$a="test";
if("test"==$a)
{
if (1==0){
echo "yes"; // this line while never be executed.
// and can be reexecuted simply by changing if (1==0) to if (1==1)
}
}
echo "finish";
if you want to try without this code, it's simple. and you can back when you want. another solution is comment blocks. or simply thinking and try in another separated code and copy paste only the result in your final code. and if a code is no longer nescessary, in your case, the result can be
$a="test";
echo "finish";
with this code, the original statement is completely respected.. :) and more readable!
Solution 18 - Php
The simple solution is to comment it out.
$a="test";
if("test"==$a)
{
//echo "yes"; //no longer needed - 7/7/2014 - updateded bla bla to do foo
}
The added benefit is your not changing your original code and you can date it, initial it and put a reason why.
Why the down vote, according to the OP request I think this is a perfectly valid solution.
"I want to [break the if statement above and] stop executing echo "yes"; or such codes which are no longer necessary to be executed, there may be or may not be an additional condition, is there way to do this?"
In fact someone could look at some of the other solutions, a year latter and wonder what is going on there. As per my suggestion, one could leave good documentation for future reference, which is always good practice.
Solution 19 - Php
What about using ternary operator?
<?php
// Example usage for: Ternary Operator
$action = (empty($_POST['action'])) ? 'default' : $_POST['action'];
?>
Which is identical to this if/else statement:
<?php
if (empty($_POST['action'])) {
$action = 'default';
} else {
$action = $_POST['action'];
}
?>
Solution 20 - Php
To completely stop the rest of the script from running you can just do
exit; //In place of break. The rest of the code will not execute
Solution 21 - Php
I'm late to the party but I wanted to contribute. I'm surprised that nobody suggested exit(). It's good for testing. I use it all the time and works like charm.
$a ='';
$b ='';
if($a == $b){
echo 'Clark Kent is Superman';
exit();
echo 'Clark Kent was never Superman';
}
The code will stop at exit() and everything after will not run.
Result
Clark Kent is Superman
It works with foreach() and while() as well. It works anywhere you place it really.
foreach($arr as $val)
{
exit();
echo "test";
}
echo "finish";
Result
nothing gets printed here.
Use it with a forloop()
for ($x = 2; $x < 12; $x++) {
echo "Gru has $x minions <br>";
if($x == 4){
exit();
}
}
Result
Gru has 2 minions
Gru has 3 minions
Gru has 4 minions
In a normal case scenario
$a ='Make hot chocolate great again!';
echo $a;
exit();
$b = 'I eat chocolate and make Charlie at the Factory pay for it.';
Result
Make hot chocolate great again!
Solution 22 - Php
$a="test";
if("test"!=$a)
{
echo "yes";
}
else
{
echo "finish";
}