CODEWITHSUNDEEP
phpwhile-loop
Rhbphp
Rhbphp

Reputation: 31

Break out of while and skip the following loops

I am looking for an element in multiple while loops, but if the element is found, I don't need to check the following while loops. How can I achieve something like this?

while(something) {
    if (this = key) {
        // break this loop and skip the next ones. Otherwise proceed to next. 
    }
}

while(somethingelse) {
    if (this = key) {
        // break this loop and skip the next ones. Otherwise proceed to next. 
    }
}

while(somethingthird) {
    if (this = key) {
        // break this loop and skip the next ones. Otherwise stop looking. 
    }
}

Upvotes: 1

Views: 121

Answers (5)

Sverri M. Olsen
Sverri M. Olsen

Reputation: 13283

goto can be used in a situation like this to jump over the while loops that should not be run.

while(something) {
    if (this = key) {
        goto yourDoom; // Breaks out of loop and goes to label "yourDoom"
    }
}
while(somethingelse) {
    if (this = key) {
        goto yourDoom; // Breaks out of loop and goes to label "yourDoom"
    }
}
while(somethingthird) {
    if (this = key) {
        goto yourDoom; // Breaks out of loop and goes to label "yourDoom"
    }
}
yourDoom: // This is a label that you can go to
// Do something

Upvotes: -1

CETb
CETb

Reputation: 372

More correct to use php operator: continue, see:

http://php.net/manual/en/control-structures.continue.php

Example: 

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

Operator: break; - break the loop http://php.net/manual/en/control-structures.break.php

while(something) {
    if (this == key) {
       break;
    }
}

Upvotes: 0

Depzor
Depzor

Reputation: 1316

Use a function

function findSpecificElement($element)
{
    while ($something) {
       if ($something == $element) {
         return $something;
       }
    } 

    while ($something) {
       if ($something == $element) {
         return $something;
       }
    } 

    ...
}

Upvotes: 0

napuzba
napuzba

Reputation: 6288

Refactor the while loops to a function and return when the element is found

function doSomething() {
    while(something) {
        if (this == key) {
            return;
        }
    }

    while(somethingelse) {
        if (this == key) {
            return;
        }
    }

    while(somethingthird) {
        if (this == key) {
            return;
        }
    }
}

Upvotes: 2

Mistalis
Mistalis

Reputation: 18279

Use a variable (boolean) that knows if your condition was checked in the previous while, like this:

$breakAll = false; //default false
while(something) {
    if (this = key) {
        // break this loop and skip the next ones. Otherwise proceed to next. 
        $breakAll = true; //now break all whiles
    }
}

while(somethingelse && !breakAll) {
    if (this = key) {
        // break this loop and skip the next ones. Otherwise proceed to next. 
        $breakAll = true; //same here
    }
}

while(somethingthird && !breakAll) {
    if (this = key) {
        // break this loop and skip the next ones. Otherwise stop looking. 
    }
}

Upvotes: 3

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