Introduction
In this article I explain how to check all the character cases in a string using PHP. For checking a character's case in a string I will use two important PHP string functions. This is a very simple technique for checking string cases.
Syntax
This function is basically used for determining if a character is upper case.
Parameter |
Description |
text |
To required testing string. |
Example
This function returns true when your input character is upper case otherwise it returns false.
<?php
//This syntax value return true
ctype_upper('HELLO')
//This syntax value return false
ctype_upper('hello')
?>
<?php
$str = array('MCNsolution', 'CHARACTER');
foreach ($str as $char)
{
if (ctype_upper($char))
{
echo "$char consists of all uppercase letters.<br>";
} else
{
echo "$char does not have all uppercase letters.<br>";
}
}
?>
Output
Syntax
This function is basically used for checking for a lower case character.
Parameter |
Description |
text |
To required testing string. |
Example
This function returns true when your input character is lower case otherwise it returns false.
<?php
//This syntax value return true
ctype_lower('hello')
//This syntax value return false
ctype_lower('HELLO')
?>
<?php
$str = array('MCNsolution', 'php', '123abc');
foreach ($str as $char)
{
if (ctype_lower($char))
{
echo "The string $char consists of all lowercase letters.<br>";
} else
{
echo "The string $char does not consist of all lowercase letters.<br>";
}
}
?>
Output