- Misspelling of Array key (case sensitive).
- If the variable comes from another script, check the script is 'include'd or 'require'd at least once;
- Did you really define/set the Array element?
- Did you unset the Array element somewhere before?
Try it out in Internet Explorer. Did it work? No. It's HTML5.
Escapses the special characters (like '"' & '$') with '\' in a string strSUBJECT and returnes the resulting escaped string. Be careful, this escapes both the single and double quotes with slash.
Use the PCRE (preg_*) family of functions.
Use this script to execute any common PHP code before your application loads. But don't make any output here.