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PHP String String Functions Manual
The strpos() function is used to find the first occurrence of a string within another string (case-sensitive).
strpos(string,find,start)
The strpos() function is used to find the first occurrence of a string within another string (case-sensitive).
Note:The strpos() function is case-sensitive.
Note:This function is binary safe.
Related Functions:
strrpos() - Find the last occurrence of the search string in another string (case-sensitive)
stripos() - Find the first occurrence of the search string in another string (case-insensitive)
strripos() -Find the last occurrence of the search string in another string (case-insensitive)
It returns the position of the first occurrence of a string in another string, or false if the string is not found
| Number | Parameters and Description |
|---|---|
| 1 | string Required. It specifies the string to be searched |
| 2 | find Required. It specifies the string to be searched for |
| 3 | start It specifies the position to start the search. If this parameter is not provided, the search will start counting from the character number of the string. If it is negative, the search will start from the specified number of characters from the end of the string |
Try the following example, find the first occurrence of 'php' in the string:
<?php
//Example1, find the first occurrence of 'php' in the string
echo strpos("www.oldtoolbag.com php basic tutorial!"php");
echo '<br>';
//Example2, find the first occurrence of 'php' in the string
echo strpos("php basic tutorial www.oldtoolbag.com!"php");
echo '<br>';
//Example3
$mystring = 'abc';
$findme = 'a';
$pos = strpos($mystring, $findme);
// Note that here we are using '==='. The simple '==' does not work as we expect.
// Because 'a' is the character at the 0th position (the first character).
if ($pos === false) {
echo "Cannot find the string '$mystring' in the string '$mystring' ";
} else {
echo "Find the string '$findme' in the string '$mystring' ";
echo "and exists at position $pos";
}
echo '<br>';
////Example4, ignore the characters before the offset position for the search
$newstring = 'abcdef abcdef';
$pos = strpos($newstring, 'a', 1); // $pos = 7, not 0
echo $pos;
?>Test and see‹/›Output Result
14 0 Find the string 'a' in the string 'abc' and check if it exists at position 0 7