diff --git a/caca-php/examples/cacapig.php b/caca-php/examples/cacapig.php
index 0eb9060..0ea30b6 100755
--- a/caca-php/examples/cacapig.php
+++ b/caca-php/examples/cacapig.php
@@ -16,6 +16,9 @@
  *  http://sam.zoy.org/wtfpl/COPYING for more details.
  */
 
+if (php_sapi_name() != "cli") {
+	die("You have to run this program with php-cli!\n");
+}
 
 $pig_str = <<<EOT
                                    
diff --git a/caca-php/examples/colors.php b/caca-php/examples/colors.php
index 25d51ce..b45cb30 100755
--- a/caca-php/examples/colors.php
+++ b/caca-php/examples/colors.php
@@ -17,6 +17,10 @@
    *  http://sam.zoy.org/wtfpl/COPYING for more details.
    */
 
+if (php_sapi_name() != "cli") {
+	die("You have to run this program with php-cli!\n");
+}
+
 $cv = caca_create_canvas(80, 24);
 if(!$cv)
 {
diff --git a/caca-php/examples/fullwidth.php b/caca-php/examples/fullwidth.php
index 3965c24..050f624 100755
--- a/caca-php/examples/fullwidth.php
+++ b/caca-php/examples/fullwidth.php
@@ -18,6 +18,10 @@
  *  http://sam.zoy.org/wtfpl/COPYING for more details.
  */
 
+if (php_sapi_name() != "cli") {
+	die("You have to run this program with php-cli!\n");
+}
+
 define('CACA', "쫊쫊쫊쫊쫊쫊쫊쫊쫊쫊쫊쫊쫊쫊쫊");
 
 $cv = caca_create_canvas(0, 0);
diff --git a/caca-php/examples/render.php b/caca-php/examples/render.php
index c6e3db4..cf4dfd1 100755
--- a/caca-php/examples/render.php
+++ b/caca-php/examples/render.php
@@ -1,6 +1,10 @@
 #!/usr/bin/php5
 <?
 
+if (php_sapi_name() != "cli") {
+	die("You have to run this program with php-cli!\n");
+}
+
 $pig_str = <<<EOT
                                    
     _._ _..._ .-',     _.._(`))    
diff --git a/caca-php/examples/truecolor.php b/caca-php/examples/truecolor.php
index 702ea2f..ad716bc 100755
--- a/caca-php/examples/truecolor.php
+++ b/caca-php/examples/truecolor.php
@@ -18,6 +18,10 @@
  *  http://sam.zoy.org/wtfpl/COPYING for more details.
  */
 
+if (php_sapi_name() != "cli") {
+	die("You have to run this program with php-cli!\n");
+}
+
 $cv = caca_create_canvas(32, 16);
 if(!$cv) {
 	die("Failed to create canvas\n");