PHP substr_count() Function: Usage, Parameters, and Examples
This article explains the PHP substr_count() function, detailing its syntax, parameter meanings, return value, and provides multiple code examples demonstrating how to count substring occurrences with optional offset and length arguments.
The substr_count() function in PHP returns the number of times a substring ( needle ) appears in a larger string ( haystack ), with case‑sensitivity.
Signature:
int substr_count(string $haystack, string $needle[, int $offset = 0[, int $length]])Parameters:
haystack : The string to search within.
needle : The substring to count.
offset (optional): The position in haystack where counting starts.
length (optional): The maximum length to search after the offset; if the sum of offset and length exceeds the length of haystack , a warning is issued.
Return value: An integer representing the count of needle occurrences.
Examples:
haystack length
echo substr_count($text, 'is', 5, 10); // warning, result 1 (non‑overlapping)
$text2 = 'gcdgcdgcd';
echo substr_count($text2, 'gcdgcd'); // 1 (does not count overlapping)
?>The examples illustrate basic counting, the effect of offset and length parameters, and the fact that overlapping substrings are not counted.
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