Search for characters in a php string

This article describes how to use strstr and strpos functions to query whether the specified string contains any expected characters. For more information, see.

The strstr () function is used to obtain the substring from the first occurrence of a specified string in another string to the end of the string. If the execution is successful, returns the remaining string (matched characters exist). If no matching character is found, false is returned.
Syntax:
String strstr (string haystack, string needle)
Haystack: A required parameter that specifies the string from which to search.
Parameter needle: A required parameter that specifies the search object. If this parameter is a numeric value, it searches for characters that match the ASCII value of this numeric value.
Instance:

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<? Php Echo strstr ("tomorrow's programming Dictionary", "edited"); // output the query string Echo "<br>"; // press Enter. Echo strstr ("www.111c.net", "111"); // output the query string (from the first m value) Echo "<br>"; // press Enter. Echo strstr ("0431-84972266", "8"); // output the query string ?>

Definition and usage
The strpos () function returns the position where the string first appears in another string.

If this string is not found, false is returned.

Syntax
Strpos (string, find, start) parameter description
String is required. Specifies the string to be searched.
Find is required. Specifies the characters to be searched.
Start is optional. Specifies the location where the search starts.
Tips and comments
Note: This function is case sensitive. Use the stripos () function to perform case-insensitive searches.
Example

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<? Php Echo strpos ("Hello world! "," Wo "); ?> Output: 6