for

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The for statement is used when you know how many times you want to execute a statement or a block of statements.

The initializer is used to set the start value for the counter of the number of loop iterations. A variable may be declared here for this purpose and it is traditional to name it $i.

The following example iterates 10 times and displays numbers from 0 to 9.

for ($i = 0; $i <= 9; $i++) {
    echo $i, ',';
}

# Example 2
for ($i = 0; ; $i++) {
  if ($i > 9) {
      break;
  }
  echo $i, ',';
}

# Example 3
$i = 0;
for (; ; ) {
    if ($i > 9) {
        break;
    }
    echo $i, ',';
    $i++;
}

# Example 4
for ($i = 0, $j = 0; $i <= 9; $j += $i, print $i. ',', $i++);

The expected output is:

0,1,2,3,4,5,6,7,8,9,

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