Turn a rule into a condition
An if statement executes a block when its condition is true. Suppose a lesson is available after completing at least two earlier lessons. That rule needs >=, meaning “greater than or equal to”.
<?php
$completed = 2;
if ($completed >= 2) {
echo "Lesson available";
} else {
echo "Complete another lesson";
}
Output
Lesson availableThe program prints Lesson available. The else branch handles a condition that is false. With >, exactly two lessons would not be enough. One word in the requirement affects the operator you choose.
Repeat work with foreach
A loop repeats work. foreach visits the elements of an array. In this standalone script, each title is printed on a separate line:
<?php
$titles = ["Variables", "Conditions"];
foreach ($titles as $title) {
echo $title . PHP_EOL;
}
Output
Variables
Conditions
The output is Variables, then Conditions on the next line. Each iteration assigns the next element to $title. For an empty array, the loop body does not run. Displaying an empty-state message requires separate behavior.
Test the boundary
For the first example, check 1, 2 and 3. Each asks a different question: what happens below the threshold, at the threshold and above it? For a list, check no elements and more than one element. Choose cases from the behavior you need.
Distinguish presentation from access control. Hiding a link in the interface does not protect its server address. If a rule needs to restrict access, tell the agent it must also apply to a direct request. The examples here only demonstrate PHP statements.
Ask for a behavior change
Give the agent this task: “Print the array's titles in their existing order. For an empty array, display No lessons yet. Do not modify the input data.” Ask for expected output for both cases, then run the code on your computer.
Kodivo lessons let you follow code and answer a knowledge check. An agent connected through MCP can discuss the material and submit the answer you select. Run your own code variations separately. Find the syntax rules in the if and foreach references.
