Signature
lcfirst ( string $string ) : string
Description
Returns a string with the first character of string lowercased if that character is alphabetic. This will not update the original string.
Example
$msg2 = lcfirst($msg1);
lcfirst_demo.php
#!/usr/bin/php
<?php
$msg1 = "Hello world";
$msg2 = lcfirst($msg1);
echo "msg1 : $msg1\n";
echo "msg2 : $msg2\n";
?>
Output
$./lcfirst_demo.php
msg1 : Hello world
msg2 : hello world
package com.smaple.app.utils;
public class StringUtil {
public static String removeFirstChar(String str) {
if (str == null || str.isEmpty()) {
throw new IllegalArgumentException("Input must not be null or empty");
}
return str.substring(1);
}
}
package com.sample.app.utils;
import static com.smaple.app.utils.StringUtil.removeFirstChar;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
public class StringUtilTest {
@Test(expected = IllegalArgumentException.class)
public void inputIsNull() {
String text = null;
removeFirstChar(text);
}
@Test(expected = IllegalArgumentException.class)
public void inputIsEmpty() {
String text = "";
removeFirstChar(text);
}
@Test
public void inputLengthIs1() {
String text = "a";
String expected = "";
String result = removeFirstChar(text);
assertEquals(expected, result);
}
@Test
public void inputLengthIsGreaterThan1() {
String text = "hello";
String expected = "ello";
String result = removeFirstChar(text);
assertEquals(expected, result);
}
}