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When developing web applications using PHP, the cosh() function is used to calculate Hyperbolic Cosine, a standard mathematical function. Although PHP comes with this function, when using the CodeIgniter framework, it is usually desirable to encapsulate common functions as helpers for reusing throughout the project. This article will explain how to encapsulate and use the cosh() function in CodeIgniter.
First, we need to create a custom Helper file. According to CodeIgniter convention, you can name the file math_helper.php and save it in the application/helpers/ directory.
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
* math_helper.php
* Custom mathematical function assistant
*/
/**
* Calculate hyperbolic cosine value
*
* @param float $value
* @return float
*/
if ( ! function_exists('cosh_safe')) {
function cosh_safe($value) {
if (!is_numeric($value)) {
return false; // Or throw an exception
}
return cosh($value);
}
}
In the above code, we use function_exists to avoid function redefinition and perform basic type checks on the input to enhance robustness.
Before using this function, you need to load this Helper in the controller or model:
$this->load->helper('math');
If you want it to be always available throughout the application, you can add it to the $autoload['helper'] array in the application/config/autoload.php file:
$autoload['helper'] = array('url', 'math');
Once Helper is loaded, the cosh_safe() function can be called directly in the controller or view:
$value = 2;
$result = cosh_safe($value);
echo "cosh({$value}) = {$result}";
Suppose you are developing a calculation page and need to output hyperbolic cosine results, you can use the following code in the view:
<form method="post" action="https://gitbox.net/index.php/math/calculate">
<input type="text" name="number" placeholder="Enter a number">
<button type="submit">calculate cosh</button>
</form>
Controller code:
public function calculate() {
$this->load->helper('math');
$number = $this->input->post('number');
$result = cosh_safe($number);
echo "The result is: " . $result;
}
By encapsulating the cosh() function into a helper function, we can not only improve the reusability of the code, but also centrally manage the verification and error handling of inputs, thereby improving code quality and maintainability. In CodeIgniter, such encapsulation is very common and recommended, especially for various mathematical or logical processing functions. Hope this article helps you better organize tool functions in your project.
