echo version_compare(PHP_VERSION,’5.0.0′); if our php version is greater than ‘5.0.0’ will print 1.

echo version_compare(PHP_VERSION,’7.0.0′); if our php version is greater than ‘7.0.0’ will print 1.

so,

if(version_compare(PHP_VERSION,’5.0.0′)>=0){

echo “php version is greater or equal to 5.0.0 ”

}