Prevent deprecation notices for implode, json_encode and substr modifiers

* Prevent deprecation notices for implode, json_encode and substr modifiers.
* unit tests

3 files changed, 38 insertions, 0 deletions

diff --git a/libs/plugins/modifier.implode.php b/libs/plugins/modifier.implode.php
new file mode 100644
index 00000000..679d71d7
--- /dev/null
+++ b/libs/plugins/modifier.implode.php
@@ -0,0 +1,15 @@
+<?php
+/**
+ * Smarty plugin
+ *
+ * @package    Smarty
+ * @subpackage PluginsModifier
+ */
+
+function smarty_modifier_implode($values, $separator = '')
+{
+	if (is_array($separator)) {
+		return implode((string) ($values ?? ''), (array) $separator);
+	}
+	return implode((string) ($separator ?? ''), (array) $values);
+}
diff --git a/libs/plugins/modifiercompiler.json_encode.php b/libs/plugins/modifiercompiler.json_encode.php
new file mode 100644
index 00000000..629277f2
--- /dev/null
+++ b/libs/plugins/modifiercompiler.json_encode.php
@@ -0,0 +1,11 @@
+<?php
+
+/**
+ * Smarty plugin
+ *
+ * @package    Smarty
+ * @subpackage PluginsModifierCompiler
+ */
+function smarty_modifiercompiler_json_encode($params) {
+	return 'json_encode(' . $params[0] . (isset($params[1]) ? ', (int) ' . $params[1] : '') . ')';
+}
diff --git a/libs/plugins/modifiercompiler.substr.php b/libs/plugins/modifiercompiler.substr.php
new file mode 100644
index 00000000..17721f52
--- /dev/null
+++ b/libs/plugins/modifiercompiler.substr.php
@@ -0,0 +1,12 @@
+<?php
+
+/**
+ * Smarty plugin
+ *
+ * @package    Smarty
+ * @subpackage PluginsModifierCompiler
+ */
+function smarty_modifiercompiler_substr($params) {
+	return 'substr((string) ' . $params[0] . ', (int) ' . $params[1] .
+		(isset($params[2]) ? ', (int) ' . $params[2] : '') . ')';
+}