Initial commit for public repo

code/loops.php

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+<?php
+
+// A loop tells PHP to run a block of code more than once.
+// A classic loop is a while loop.
+// A "while" loop will continue to run the block of code as long as the value in parentheses is true.
+$num = 5;
+while ($num > 0) {
+    echo "While loop $num\n";
+    --$num;
+}
+
+// A "do while" loop is similar to a "while" loop except it always runs at least
+// one iteration. In a classic "while" loop, no iterations may be executed if
+// the value in parentheses is false. In a "do while", the boolean check
+// is not done until after the execution of an iteration.
+$num = 0;
+do {
+    echo "Do while $num\n";
+    ++$num;
+} while ($num < 5);
+
+// "for" loops allow you to create a more concise while loop.
+// Inside the parentheses, the left section creates a variable before the loop
+// starts, the middle section is the check that is done at the beginning of each loop
+// and the third section is executed after each loop.
+for ($i = 0; $i < 10; $i++) {
+    echo "For loop $i\n";
+}
+
+// A "foreach" loop allows you to easily loop over an array.
+// An array is a list of data stored together.
+// The "as" keyword lets you assign a variable to the value
+// in the array for the current iteration of the loop.
+$set = [1, 2, 3, 4, 5];
+foreach ($set as $num) {
+    echo "Array value $num\n";
+}
+
+// In loops, you can use the keyword "break" to stop the loop execution
+// no matter how many more iterations should run.
+$values = ['one', 'two', 'three'];
+foreach ($values as $value) {
+    if ($value === 'two') {
+        break;
+    }
+    echo "Break $value\n";
+}
+
+// The "continue" keyword stops executing the current loop iteration,
+// but then allows the loop to continue with other iterations.
+$values = ['one', 'skip', 'three'];
+foreach ($values as $value) {
+    if ($value === 'skip') {
+        continue;
+    }
+    echo "Continue $value\n";
+}