PHP string functions

1. strlen(string)
   Return length of a string
2. strpos(string, char)
   Return position of the first occurrence of a string in another string
3. str_replace(old_word, new_word, string)
   Replace a string with another string in a string
4. addslashes(str)
   Return a string by adding a backslash in front of commas in given string
5. chr(number)
   Return the character of the specified character of ASCII (65)
6. explode(string)
   Break a string into an array
7. implode(array)
   Return a string from elements of an array.
8. join
   Alternative of implode
9. lcfirst(string)
   Convert the first character of a string into lower case
10. md5(string)
    Calculate md5 of a string
11. nl2br(string)
    Insert line break in front of each newline in a string
12. ltrim (string)
    Remove whitespace and other characters from the left side of a string
13. rtrim(string)
    Remove whitespace and other characters from the right side of a string
14. str_split(string)
    Split a string into an array
15. strip_tags(string)
    Strip HTML, PHP tags from a string
16. substr(string, start, end)
    Return a part of a string
17. ucfirst(string)
    Convert the first character into uppercase of a string
18. ucwords(string)
    Convert the first character into uppercase of each word
19. wordwrap(string, n, "\n\r<br>")
    Wrap a string to a given number of characters.

<?php 

echo strlen("web design");
echo "<br>";

echo str_word_count("web design");
echo "<br>";

echo strrev("web design");
echo "<br>";

echo strpos("web design", "design");
echo "<br>";

echo str_replace("design", "development", "web design");
echo "<br>";

echo addslashes("web design's");
echo "<br>";

echo chr(65);
echo "<br>";

print_r( explode(" ", "Web design") );
echo "<br>";

echo implode(" ", ["web", "design"]);
echo "<br>";

echo join(" ",["web", "design"]);
echo "<br>";

echo lcfirst("WEB DESIGN");
echo "<br>";

echo md5("web design");
echo "<br>";

echo nl2br("web design \r\n capscom technology almora");
echo "<br>";

echo ltrim("  web design  ");
echo "<br>";

echo rtrim("  web design  ");
echo "<br>";

print_r(str_split("web design"));
echo "<br>";

echo strip_tags("<h1>web design</h1>");
echo "<br>";

echo substr("web design", 3, 7);
echo "<br>";

echo ucfirst("web design");
echo "<br>";

echo ucwords("web design");
echo "<br>";

echo wordwrap("web design and development", 10, "<br>\n");
echo "<br>";
?>