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Z mojej strony serwisowi należy się bardzo mocna pochwała. Nawet późna pora zgłoszenia problemu (23.00) nie przeszkodziła Darkowi w jego rozwiązaniu. Do tego poziom odpisywania na maile jest bardzo wysoki... wszystko wykłada jak cierpliwy nauczyciel. Śmiało mogę przyznać, że zamieszczone na stronach porady są rzeczowo opisane - a nie jak to bywa w innych serwisach mamy sam kod i nic poza tym! Jeszcze raz wielkie dzięki!
Damian Jarosz
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PODRĘCZNIK PHP 5.x, 4.x, 3.x - częściowo spolszczony / źródło: www.php.net
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substr_count (PHP 4, PHP 5) substr_count -- Count the number of substring occurrences Descriptionint substr_count ( string haystack, string needle )
substr_count() returns the number of times the
needle substring occurs in the
haystack string. Please note that
needle is case sensitive.
Przykład 1. substr_count() example |
<?php
echo substr_count("This is a test", "is"); ?>
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See also count_chars(),
strpos(), substr(),
and strstr().
User Contributed NotesXinfoX X at X XkarlX X-X XphilippX X dot X XdeX
21-Dec-2003 10:27
Yet another reference to the "cgcgcgcgcgcgc" example posted by "chris at pecoraro dot net":
Your request can be fulfilled with the Perl compatible regular expressions and their lookahead and lookbehind features.
The example
$number_of_full_pattern = preg_match_all('/(cgc)/', "cgcgcgcgcgcgcg", $chunks);
works like the substr_count function. The variable $number_of_full_pattern has the value 3, because the default behavior of Perl compatible regular expressions is to consume the characters of the string subject that were matched by the (sub)pattern. That is, the pointer will be moved to the end of the matched substring.
But we can use the lookahead feature that disables the moving of the pointer:
$number_of_full_pattern = preg_match_all('/(cg(?=c))/', "cgcgcgcgcgcgcg", $chunks);
In this case the variable $number_of_full_pattern has the value 6.
Firstly a string "cg" will be matched and the pointer will be moved to the end of this string. Then the regular expression looks ahead whether a 'c' can be matched. Despite of the occurence of the character 'c' the pointer is not moved.
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