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@themorgantown
Created July 13, 2023 18:01
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php 7+
<?php
$upload_mb = upload_mb();
/**
* Calculate the maximum file upload size
*
* @return string Formatted size string
*/
function upload_mb() {
$max_upload = parse_size(ini_get('upload_max_filesize'));
$max_post = parse_size(ini_get('post_max_size'));
$memory_limit = parse_size(ini_get('memory_limit'));
// Check for null values and handle gracefully
if ($max_upload === null || $max_post === null || $memory_limit === null) {
return 'unknown';
}
$upload_mb = min($max_upload, $max_post, $memory_limit);
// Check if there is no limit
if ($upload_mb === 0 || $upload_mb === PHP_INT_MAX) {
return 'unlimited';
} elseif ($upload_mb < 0) {
return 'unknown';
} else {
return format_size($upload_mb);
}
}
/**
* Convert size string to bytes
*
* @param string $size Size string with a unit like '2M' or '512K'
* @return float Size in bytes
*/
function parse_size($size) {
$unit = preg_match('/(k|m|g)$/i', $size, $matches) ? strtolower($matches[1]) : '';
$size = (float) $size;
if (!is_numeric($size)) {
// Default value of 20MB in bytes
return 20 * 1024 * 1024;
}
switch ($unit) {
case 'g':
$size *= 1024 * 1024 * 1024;
break;
case 'm':
$size *= 1024 * 1024;
break;
case 'k':
$size *= 1024;
break;
}
return is_numeric($size) ? round($size) : null;
}
/**
* Format the size value into a human-readable string
*
* @param float $size Size value in bytes
* @return string Formatted size string
*/
function format_size($size) {
if ($size >= 1073741824) {
return round($size / 1073741824, 2) . 'GB';
} elseif ($size >= 1048576) {
return round($size / 1048576, 2) . 'MB';
} elseif ($size >= 1024) {
return round($size / 1024, 2) . 'KB';
} else {
return round($size) . 'B';
}
}
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