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Filename : Header.php
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<?php

/**
 * This file is part of CodeIgniter 4 framework.
 *
 * (c) CodeIgniter Foundation <admin@codeigniter.com>
 *
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 */

namespace CodeIgniter\HTTP;

/**
 * Class Header
 *
 * Represents a single HTTP header.
 */
class Header
{
    /**
     * The name of the header.
     *
     * @var string
     */
    protected $name;

    /**
     * The value of the header. May have more than one
     * value. If so, will be an array of strings.
     *
     * @var array|string
     */
    protected $value;

    /**
     * Header constructor. name is mandatory, if a value is provided, it will be set.
     *
     * @param array|string|null $value
     */
    public function __construct(string $name, $value = null)
    {
        $this->name = $name;
        $this->setValue($value);
    }

    /**
     * Returns the name of the header, in the same case it was set.
     */
    public function getName(): string
    {
        return $this->name;
    }

    /**
     * Gets the raw value of the header. This may return either a string
     * of an array, depending on whether the header has multiple values or not.
     *
     * @return array|string
     */
    public function getValue()
    {
        return $this->value;
    }

    /**
     * Sets the name of the header, overwriting any previous value.
     *
     * @return $this
     */
    public function setName(string $name)
    {
        $this->name = $name;

        return $this;
    }

    /**
     * Sets the value of the header, overwriting any previous value(s).
     *
     * @param array|string|null $value
     *
     * @return $this
     */
    public function setValue($value = null)
    {
        $this->value = $value ?? '';

        return $this;
    }

    /**
     * Appends a value to the list of values for this header. If the
     * header is a single value string, it will be converted to an array.
     *
     * @param array|string|null $value
     *
     * @return $this
     */
    public function appendValue($value = null)
    {
        if ($value === null) {
            return $this;
        }

        if (! is_array($this->value)) {
            $this->value = [$this->value];
        }

        if (! in_array($value, $this->value, true)) {
            $this->value[] = $value;
        }

        return $this;
    }

    /**
     * Prepends a value to the list of values for this header. If the
     * header is a single value string, it will be converted to an array.
     *
     * @param array|string|null $value
     *
     * @return $this
     */
    public function prependValue($value = null)
    {
        if ($value === null) {
            return $this;
        }

        if (! is_array($this->value)) {
            $this->value = [$this->value];
        }

        array_unshift($this->value, $value);

        return $this;
    }

    /**
     * Retrieves a comma-separated string of the values for a single header.
     *
     * NOTE: Not all header values may be appropriately represented using
     * comma concatenation. For such headers, use getHeader() instead
     * and supply your own delimiter when concatenating.
     *
     * @see https://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.2
     */
    public function getValueLine(): string
    {
        if (is_string($this->value)) {
            return $this->value;
        }
        if (! is_array($this->value)) {
            return '';
        }

        $options = [];

        foreach ($this->value as $key => $value) {
            if (is_string($key) && ! is_array($value)) {
                $options[] = $key . '=' . $value;
            } elseif (is_array($value)) {
                $key       = key($value);
                $options[] = $key . '=' . $value[$key];
            } elseif (is_numeric($key)) {
                $options[] = $value;
            }
        }

        return implode(', ', $options);
    }

    /**
     * Returns a representation of the entire header string, including
     * the header name and all values converted to the proper format.
     */
    public function __toString(): string
    {
        return $this->name . ': ' . $this->getValueLine();
    }
}