address PHP 8.1 'explode', 'number_format', and 'replace' deprecations (#755)

3 files changed, 52 insertions, 1 deletions

diff --git a/libs/plugins/modifier.explode.php b/libs/plugins/modifier.explode.php
new file mode 100644
index 00000000..5186fde3
--- /dev/null
+++ b/libs/plugins/modifier.explode.php
@@ -0,0 +1,25 @@
+<?php
+/**
+ * Smarty plugin
+ *
+ * @package    Smarty
+ * @subpackage PluginsModifier
+ */
+
+/**
+ * Smarty explode modifier plugin
+ * Type:     modifier
+ * Name:     explode
+ * Purpose:  split a string by a string
+ *
+ * @param string   $separator
+ * @param string   $string
+ * @param int|null $limit
+ *
+ * @return array
+ */
+function smarty_modifier_explode($separator, $string, ?int $limit = null)
+{
+    // provide $string default to prevent deprecation errors in PHP >=8.1
+    return explode($separator, $string ?? '', $limit ?? PHP_INT_MAX);
+}
diff --git a/libs/plugins/modifier.number_format.php b/libs/plugins/modifier.number_format.php
new file mode 100644
index 00000000..8c612601
--- /dev/null
+++ b/libs/plugins/modifier.number_format.php
@@ -0,0 +1,26 @@
+<?php
+/**
+ * Smarty plugin
+ *
+ * @package    Smarty
+ * @subpackage PluginsModifier
+ */
+
+/**
+ * Smarty number_format modifier plugin
+ * Type:     modifier
+ * Name:     number_format
+ * Purpose:  Format a number with grouped thousands
+ *
+ * @param float|null  $num
+ * @param int         $decimals
+ * @param string|null $decimal_separator
+ * @param string|null $thousands_separator
+ *
+ * @return string
+ */
+function smarty_modifier_number_format(?float $num, int $decimals = 0, ?string $decimal_separator = ".", ?string $thousands_separator = ",")
+{
+    // provide $num default to prevent deprecation errors in PHP >=8.1
+    return number_format($num ?? 0.0, $decimals, $decimal_separator, $thousands_separator);
+}
diff --git a/libs/plugins/shared.mb_str_replace.php b/libs/plugins/shared.mb_str_replace.php
index c6079c12..7e85f7aa 100644
--- a/libs/plugins/shared.mb_str_replace.php
+++ b/libs/plugins/shared.mb_str_replace.php
@@ -62,7 +62,7 @@ if (!function_exists('smarty_mb_str_replace')) {
                 $replace = mb_convert_encoding($replace, $current_charset, Smarty::$_CHARSET);
             }
 
-            $parts = mb_split(preg_quote($search), $subject) ?: array();
+            $parts = mb_split(preg_quote($search), $subject ?? "") ?: array();
             // If original regex encoding was not unicode...
             if(!$reg_is_unicode) {
                 // ...restore original regex encoding to avoid breaking the system.