我想在PHP验证中只允许2个字母之间的1个逗号

Question

Hello I have a scenario that, in textbox I can enter string like

"1,2,3" this would be allowed.

but if someone enters,

"1,2,,3" this would not be allowed.

allowed multiple commas but not like above.

Thanks in advance

Answer 1

Try this,

if(in_array("", explode(',',$str)))
{
    // validation fail
}