1 files changed, 77 insertions, 0 deletions
diff --git a/zend/exists.cpp b/zend/exists.cpp
new file mode 100644
index 0000000..1177e47
--- /dev/null
+++ b/zend/exists.cpp
@@ -0,0 +1,77 @@
+/**
+ *  Exists.cpp
+ *
+ *  This file holds the implementation of all *_exists() functions, 
+ *  like class_exists(), et cetera
+ *
+ *  @author andot <https://github.com/andot>
+ */
+
+/**
+ *  Dependencies
+ */
+#include "includes.h"
+
+/**
+ *  On php 5.3 ZEND_ACC_TRAIT isn't defined, so we simply define it to 0
+ *  so all operations with it are basically no-ops. Currently unconfirmed
+ *  if this actually works correctly on php 5.3, but it at least compiles.
+ */
+#ifndef ZEND_ACC_TRAIT
+#define ZEND_ACC_TRAIT 0
+#endif
+
+/**
+ *  Open the PHP namespace
+ */
+namespace Php {
+
+/**
+ *  Check whether a class with a certain name exists
+ *  @param  classname
+ *  @param  len
+ *  @param  autoload
+ *  @return bool
+ */
+bool class_exists(const char *classname, size_t len, bool autoload) 
+{
+    // we need the tsrm_ls variable
+    TSRMLS_FETCH();
+
+    // we're going to load a class-entry
+    zend_class_entry **ce;
+
+    // should we autoload the class?
+    if (autoload) 
+    {
+        // no auto-load
+        if (SUCCESS != zend_lookup_class(classname, len, &ce TSRMLS_CC)) return false;
+
+        // the found "class" could also be an interface or trait, which we do no want
+        return ((*ce)->ce_flags & (ZEND_ACC_INTERFACE | (ZEND_ACC_TRAIT - ZEND_ACC_EXPLICIT_ABSTRACT_CLASS))) == 0;
+    }
+    else
+    {
+        // starting slashes can be ignored
+        if (len > 0 && classname[0] == '\\') { classname++; len--; }
+        
+        // all classes are in lowercase in the hash, so we make 
+        // a temporary buffer for storing the lowercase class name
+        // (is this smart? memory allocation is expensive!)
+        std::unique_ptr<char[]> lc_name(new char[len + 1]);
+        
+        // copy the name to lowercase, but ignore the starting slash (if there is one)
+        zend_str_tolower_copy(lc_name.get(), classname, len);
+
+        // see if there is a class with this name
+        if (SUCCESS != zend_hash_find(EG(class_table), lc_name.get(), len + 1, (void **) &ce)) return false;
+        
+        // the found "class" could also be an interface or trait, which we do no want
+        return !(((*ce)->ce_flags & (ZEND_ACC_INTERFACE | ZEND_ACC_TRAIT)) > ZEND_ACC_EXPLICIT_ABSTRACT_CLASS);
+    }
+}
+
+/**
+ *  End of namespace
+ */
+}