stristr – Searching inside a text string

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$main_string="This is a test string <a href=http://www.plus2net.com>with a link</a> to plus2net";
if(stristr($main_string,"http://")){
echo "String contains a link or the text http:// inside it ";}
else {
echo "String does not contains a link or the text http:// inside it ";}