what is the syntax of the SUBSTR_COUNT() function in php?
substr_count(string,substring,start,length)| Parameter | Description |
|---|---|
| string | Required. Specifies the string to check |
| substring | Required. Specifies the string to search for |
| start | Optional. Specifies where in string to start searching. If negative, it starts counting from the end of the string |
| length | Optional. Specifies the length of the search |
examples of the SUBSTR_COUNT() function
Example 1. In this example, we count the number of times “world” occurs in the string.
<?php
echo substr_count("Hello world. The world is nice","world");
?>Example 2. In this example, we use all parameters.
<?php
$str = "This is nice";
echo strlen($str)."<br>"; // Using strlen() to return the string length
echo substr_count($str,"is")."<br>"; // The number of times "is" occurs in the string
echo substr_count($str,"is",2)."<br>"; // The string is now reduced to "is is nice"
echo substr_count($str,"is",3)."<br>"; // The string is now reduced to "s is nice"
echo substr_count($str,"is",3,3)."<br>"; // The string is now reduced to "s i"
?>Example 3. In this example, we overlapped substrings.
<?php
$str = "abcabcab";
echo substr_count($str,"abcab"); // This function does not count overlapped substrings
?>Example 3. In this example, if we the start and length parameters exceeds the string length, this function will output a warning.
<?php
echo $str = "This is nice";
substr_count($str,"is",3,9);
?>
