如何检查字符串中的波斯字符由php

Question

如何检查字符串中的波斯字符由php？

见下文

string valid : persian character 

string invalid : except persian character(contain: latin && {&*%$ ,....}) 

Answer 1

$alphabet = ['الف', 'بِ', 'پِ', '...']; # create an array that contains only Persian characters 
$alphabet = array_flip($alphabet); # reverse the array (key <=> value) 

$chars = preg_split('/(?<!^)(?!$)/u', $string); # use this regexp to transform string intro array of chars 

foreach ($chars as $char) 
{ 
    if (!isset($alphabet[$char])) # use isset to check the char in the aplhabet 
    { 
     # it's not Persian character! 
    } 
}