check value contains numbers or letters php
ctype_digit(string text);
Parameter Used:
The ctype_digit() function in PHP accepts only one parameter.
text : Its mandatory parameter which specifies the tested string.
Return Values:
It returns TRUE if all characters of the string are numeric otherwise
return FALSE.
Input : '789495001'
Output : TRUE
Explanation : All digits, return True
Input : 'adc123' or '789.0877'
Output : FALSE
Explanation: String contains number and string or floating point,
return false.