1--TEST--
2Test preg_replace_callback() function : basic functionality
3--FILE--
4<?php
5/*
6* Function is implemented in ext/pcre/php_pcre.c
7*/
8/*
9* Basic test for preg_replace_callback
10*/
11$replacement = array('zero', 'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine'); //array will have the default key values (0-9) and each value is the corresponding key written in words.
12function integer_word($matches) {
13    global $replacement;
14    return $replacement[$matches[0]]; //all examples will be looking for an integer value, if one is found it will be stored in $matches[0] which corresponds to a key in the $replacements array
15
16}
17$subject1 = 'there are 7 words in this sentence.';
18$new_subject1 = preg_replace_callback('/\d/', "integer_word", $subject1);
19print "$new_subject1 \n";
20$subject2 = '1 2 3 4 is now written in words';
21$new_subject2 = preg_replace_callback('/\d/', "integer_word", $subject2, 3); //limits to three replacements
22print "$new_subject2 \n";
23$subject3 = 'there are no numbers in this string';
24$new_subject3 = preg_replace_callback('/\d/', "integer_word", $subject3, 5, $count); //limites to five replacements and counts the number of replacements made ands stores in $count variable
25print "$new_subject3 \n";
26print $count;
27?>
28--EXPECT--
29there are seven words in this sentence.
30one two three 4 is now written in words
31there are no numbers in this string
320
33