Sorting Arrays

PHP provides sort functions for values, keys, and key-value relationships. sort reindexes a list; asort preserves key associations; usort applies a comparator. Sorting mutates the array, so copy it first if the original order is needed elsewhere. The comparator returns an ordering based on the numeric values. Further guidance Choose list indexes for ordered items and descriptive keys for named fields. Check whether an expected key exists before reading it, and preserve keys when their association matters during sorting or filtering. Use a small fixture to test empty, single-item, and nested data. Practice task: Create a fresh example for Sorting Arrays. Predict the result before running it, then change one input and explain why the result changes. Test a normal case and one boundary or invalid case where it applies. Compare your output with the example and note one rule you would use in a real project.