PHP frenchtojd() Function: Usage and Examples

Use frenchtojd() when you need to converts a French Republican calendar date to a Julian day number in a PHP application. The examples below show the actual operation and its limitations.

What Is frenchtojd() in PHP?

Converts a French Republican calendar date to a Julian day number. The exact signature supported by your installation depends on its PHP version and enabled extensions.

Its syntax is:

frenchtojd(int $month, int $day, int $year): int

Parameters and return value: The parameter types, optional arguments, references, and return type are shown in the signature above. Optional parameters are marked with an ellipsis in this reference signature.

Example 1: Basic Usage

<?php

echo frenchtojd(1,1,1);

Result: Run the example in an environment that supports the function. Any values depending on operating-system state, installed extensions, process configuration, or network access must be checked on the target server.

Example 2: Different Input or Behavior

<?php

echo frenchtojd(2,1,1);

Result: Run the example in an environment that supports the function. Any values depending on operating-system state, installed extensions, process configuration, or network access must be checked on the target server.

Practical Example: Applying the Function

<?php

$julianDay = frenchtojd(1,1,1); echo $julianDay > 0 ? "Converted" : "Unsupported";

Result: Run the example in an environment that supports the function. Any values depending on operating-system state, installed extensions, process configuration, or network access must be checked on the target server.

Important Behavior and Edge Cases

The French Republican calendar has limited supported years and requires the calendar extension.

Comparison With Related Functions

Common Beginner Mistakes

Key Takeaways

• Converts a French Republican calendar date to a Julian day number.
• The French Republican calendar has limited supported years and requires the calendar extension.
• jdtofrench() converts a Julian day number back to a French Republican date.

Use frenchtojd() for the specific operation demonstrated above. Check its prerequisites and handle failure conditions before using it with production data.