PHP version_compare() Function: Usage and Examples

Compares two PHP-style version strings and optionally evaluates a comparison operator.

What It Does and When to Use It

Compare release numbers correctly rather than lexically. A minimum platform requirement controls what syntax can be parsed; target-version tests find runtime and extension incompatibilities.

Requirements, Inputs and Expected Behavior

Confirm the runtime, extension, environment variables, and permissions before running the examples in production. Do not use lexical string comparisons for versions such as 8.10 and 8.9.

Example 1: Basic Operation

Compare release numbers correctly rather than lexically.

<?php
echo version_compare('8.10.0', '8.9.0');

Example 2: Behavior and Validation

Check a minimum supported PHP runtime.

<?php
var_dump(version_compare(PHP_VERSION, '8.4', '>='));

Practical Example: Application Use

Sort version strings using PHP-aware ordering, including prereleases.

<?php
$constraints = ['8.3.12', '8.4.0RC1', '8.4.0'];
 usort($constraints, 'version_compare');
 print_r($constraints);

Important Behavior and Edge Cases

The second example highlights: Check a minimum supported PHP runtime. The practical example adds: Sort version strings using PHP-aware ordering, including prereleases.

Comparison with Related Approaches

Common Beginner Mistakes

Key Takeaways

• Compares two PHP-style version strings and optionally evaluates a comparison operator.
• Sort version strings using PHP-aware ordering, including prereleases.
• Do not introduce syntax from a newer minor version before every production host supports it.