PHP Nested Loops - What are nested loops in PHP?

Nested loops in PHP are loops that are placed inside one another. They allow you to perform a series of loops within a loop, which can be useful for iterating over two-dimensional arrays or for performing a set of operations multiple times.

The syntax for nested loops in PHP is similar to the syntax for regular loops, with the inner loop being placed inside the curly braces of the outer loop. For example, here is a simple nested for loop that counts from 1 to 3 in both the outer loop and the inner loop:

for ($i = 1; $i <= 3; $i++) {
for ($j = 1; $j <= 3; $j++) {
echo $i . "," . $j . "\n";
}
}

This code will output the strings “1,1”, “1,2”, “1,3”, “2,1”, “2,2”, “2,3”, “3,1”, “3,2”, and “3,3”, each on a new line. The outer loop iterates over the values 1, 2, and 3 for $i, and the inner loop iterates over the values 1, 2, and 3 for $j.

You can use any type of loop inside a nested loop, including while loops, do...while loops, for loops, and foreach loops. You can also nest loops of different types inside one another, as long as you follow the proper syntax and indentation.

Nested loops are loops that are placed inside other loops in PHP. They allow you to iterate over multiple sets of data at the same time, or to perform a task repeatedly within another loop.

The syntax for a nested loop in PHP is as follows:

for (initialization; condition; increment) {
// code to be executed
for (initialization; condition; increment) {
// code to be executed
}
}

while (condition) {
// code to be executed
while (condition) {
// code to be executed
}
}

do {
// code to be executed
do {
// code to be executed
} while (condition);
} while (condition);

In each case, the inner loop is placed inside the body of the outer loop, and the inner loop will be executed multiple times for each iteration of the outer loop.

Here is an example of a nested for loop that iterates over a two-dimensional array:

$array = array(array(1, 2, 3), array(4, 5, 6), array(7, 8, 9));

for ($i = 0; $i < count($array); $i++) {
for ($j = 0; $j < count($array[$i]); $j++) {
echo $array[$i][$j] . "\n";
}
}

This nested loop will output the numbers 1 through 9, each on a new line. The outer loop iterates over the rows of the array

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PHP Nested Loops – What are nested loops in PHP?