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PHP : Language Reference : Control Structures : continue

continue

continue is used within looping structures to skip the rest of the current loop iteration and continue execution at the condition evaluation and then the beginning of the next iteration.

Note:

Note that in PHP the switch statement is considered a looping structure for the purposes of continue.

continue accepts an optional numeric argument which tells it how many levels of enclosing loops it should skip to the end of.

<?php
while (list($key, $value) = each($arr)) {
if (!(
$key % 2)) { // skip odd members
continue;
}
do_something_odd($value);
}

$i = 0;
while (
$i++ < 5) {
echo
"Outer<br />\n";
while (
1) {
echo
"&nbsp;&nbsp;Middle<br />\n";
while (
1) {
echo
"&nbsp;&nbsp;Inner<br />\n";
continue
3;
}
echo
"This never gets output.<br />\n";
}
echo
"Neither does this.<br />\n";
}
?>

Omitting the semicolon after continue can lead to confusion. Here's an example of what you shouldn't do.

<?php
for ($i = 0; $i < 5; ++$i) {
if (
$i == 2)
continue
print
"$i\n";
}
?>

One can expect the result to be :

0
1
3
4

but this script will output :

2

because the return value of the print() call is int(1), and it will look like the optional numeric argument mentioned above.

Related Examples ( Source code ) » control_structures.continue


Code Examples / Notes » control_structures.continue

greg

You using continue in a file included in a loop will produce an error.  For example:
//page1.php
for($x=0;$x<10;$x++)
  {
   include('page2.php');    
}
//page2.php
if($x==5)
   continue;
else
  print $x;
it should print
"012346789" no five, but it produces an error:
Cannot break/continue 1 level in etc.


www.derosetechnologies.com

In the same way that one can append a number to the end of a break statement to indicate the "loop" level upon which one wishes to 'break' , one can append a number to the end of a 'continue' statement to acheive the same goal. Here's a quick example:
<?
for ($i = 0;$i<3;$i++) {
echo "Start Of I loop\n";
for ($j=0;;$j++) {

if ($j >= 2) continue 2; // This "continue" applies to the "$i" loop
echo "I : $i J : $j"."\n";
}
echo "End\n";
}
?>
The output here is:
Start Of I loop
I : 0 J : 0
I : 0 J : 1
Start Of I loop
I : 1 J : 0
I : 1 J : 1
Start Of I loop
I : 2 J : 0
I : 2 J : 1
For more information, see the php manual's entry for the 'break' statement.


net_navard

Hello firends
It is said in manually:
continue also accepts an optional numeric argument which tells it how many levels of enclosing loops it should .
In order to understand better this,An example for that:
<?php
/*continue also accepts an optional numeric argument which
tells it how many levels of enclosing loops it should skip.*/
for($k=0;$k<2;$k++)
{//First loop

for($j=0;$j<2;$j++)
{//Second loop
 for($i=0;$i<4;$i++)
 {//Third loop
if($i>2)
continue 2;// If $i >2 ,Then it skips to the Second loop(level 2),And starts the next step,
echo "$i\n";
      }
}
}
?>
Merry's christmas :)

With regards,Hossein


szrrya

Documentation states:
"continue is used within looping structures to skip the rest of the current loop iteration"
Current functionality treats switch structures as looping in regards to continue.  It has the same effect as break.
The following code is an example:
<?php
for ($i1 = 0; $i1 < 2; $i1++) {
 // Loop 1.
 for ($i2 = 0; $i2 < 2; $i2++) {
   // Loop 2.
   switch ($i2 % 2) {
     case 0:
       continue;
       break;
   }
   print '[' . $i2 . ']
';
 }
 print $i1 . '
';
}
?>
This outputs the following:
[0]
[1]
0
[0]
[1]
1
Switch is documented as a block of if...elseif... statements, so you might expect the following output:
[1]
0
[1]
1
This output requires you to either change the switch to an if or use the numerical argument and treat the switch as one loop.


cellog

continue works for:
do
while
switch
for
foreach


dedlfix gives me a hint

a possible solution for
greg AT laundrymat.tv
I've got the same problem as Greg
and now it works very fine by using
return() instead of continue.
It seems, that you have to use return()
if you have a file included and
you want to continue with the next loop


tufan dot oezduman

a possible explanation for the behavior of continue in included scripts mentioned by greg and dedlfix above may be the following line of the "return" documentation: "If the current script file was include()ed or require()ed, then control is passed back to the calling file."
The example of greg produces an error since page2.php does not contain any loop-operations.
So the only way to give the control back to the loop-operation  in page1.php would be a return.


rene

(only) the reason that is given on the "Continue with missing semikolon" example is wrong.
the script will output "2" because the missing semikolon causes that the "print"-call is executed only if the "if" statement is true. It has nothing to to with "what" the "print"-call would return or not return, but the returning value can cause to skip to the end of higher level Loops if any call is used that will return a bigger number than 1.
<?php
continue print "$i\n";
?>
because of the optional argument, the script will not run into a "unexpected T_PRINT" error. It will not run into an error, too, if the call after continue does return anything but a number.
i suggest to change it from:
because the return value of the print() call is int(1), and it will look like the optional numeric argument mentioned above.
to
because the print() call will look like the optional numeric argument mentioned above.


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