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some examples using substr(),
extracting the first, last, n chars of a string.
reverse a string or see how many times a char is used in a string.
<?php
echo '
<form method="post" action="'.$_SERVER['PHP_SELF'].'">
<input type="text" name="word">
<input type="submit" value="see">
</form>';
if(!empty($_POST['word']))
{
$str = $_POST['word'];
$char['original'] = $str;
$char['words'] = explode(' ',$str);
$char['word_count'] = count($char['words']);
$char['first_char'] = substr($str,0,1);
$char['last_char'] = substr($str,-1);
$char['all_but_first_char'] = substr($str,1);
$char['all_but_last_char'] = substr($str,0,-1);
for($x = 0; $x < strlen($str); $x++)
{
$char['chars'][] = substr($str,$x,1);
$char['char_repeat'][substr($str,$x,1)]++;
}
$char['char_count'] = strlen($str);
ksort($char['char_repeat']);
$char['reverse'] = join('',array_reverse($char['chars']));
echo '<pre>';
print_r($char);
echo '</pre>';
}
?>
learn more about some of the PHP functions used in this snippet: array, array_reverse, count, echo, empty, explode, extract, for, join, ksort, ord, print, print_r, sort, strlen, substr, time
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