PHP Loops

Loops execute the same code multiple times.

While Loop:

While(condition){
//repeat something while the condition is true
}

While(condition){

//repeat something while the condition is true

}

Example:

$i =0;
while($i < 10){
$i++;
echo $i.'
';
}

$i =0;

while($i < 10){

$i++;

echo $i.'

}

Here loop will run until $i is less than 10.

Continue Keyword:

$i =0;
while($i < 10){
$i++;
	if($i % 2){
		continue;
	}
echo $i.'
';
}

$i =0;

while($i < 10){

$i++;

if($i % 2){

continue;

}

echo $i.'

}

This condition will fail when $i is odd number. So when $i is odd the condition will fail and it will go back to the top of the loop.

Do…While Loop

do{
 //Repeat as long as condition is true
} while(condition);

do{

//Repeat as long as condition is true

} while(condition);

The difference between while and do while loop is that do while loop is always executed at least once even if the condition never true.

$i =100;
do{
$i++;
echo $i.'
';
} while($i < 10 );

$i =100;

do{

$i++;

echo $i.'

} while($i < 10 );

Using for loop:

The main advantage of using a for loop that the chances of going to the infinite loop are less.

for(initial counter; condition; increment){
//repeat something while condition is true
}

for(initial counter; condition; increment){

//repeat something while condition is true

}

Example

for ($i = 0; $i <= 10; $i++) {
    echo "The number is: $i 
";
}

for ($i = 0; $i <= 10; $i++) {

echo "The number is: $i

}

foreach : Loop through Array

Accessing Array Values

foreach($arrayName as $value){
  //Do something with $value
}

foreach($arrayName as $value){

//Do something with $value

}

Example

$name = array("kriti", "dev", "sam", "matu"); 
foreach ($name as $value) {
    echo "$value 
";
}

$name = array("kriti", "dev", "sam", "matu");

foreach ($name as $value) {

echo "$value

}

A foreach loop accesses each array element, and it is similar to for loop for indexed array.
foreach loop is only used when you have to process everything in order.
for loop is better when you don’t want to loop through the whole array.
foreach loop is mainly useful for an associative array.