A stack with type restricted to int
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<? class IntStack { var $the_stack; var $count = 0; function push ($intvar) { if (is_integer($intvar)) { $this->the_stack[$this->count] = $intvar; $this->count++; print("Push of $intvar succeeded.<BR>"); } else { print("Hey, IntStack is for ints only!<BR>"); } } function pop () { if ($this->count > 0) { $this->count--; // decrement count $top = $this->the_stack[$this->count]; return($top); } else { print("Hey, the stack is empty!<BR>"); } } } $my_stack = new IntStack; $my_stack->push(1); $my_stack->push(49); $my_stack->push("A");
$pop_result = $my_stack->pop(); print("Top of the stack was $pop_result<BR>");
$pop_result = $my_stack->pop(); print("Top of the stack was $pop_result<BR>");
$pop_result = $my_stack->pop(); print("Top of the stack was $pop_result<BR>");
?>
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