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Extracting a found portion of a string

strstr and stristr functions return the first occurrence of a string

The strstr( ) and stristr( ) functions search for the substring needle in the string haystack and return the portion of haystack from the first occurrence of needle to the end of haystack:

string strstr(string haystack, string needle)
string stristr(string haystack, string needle)

strstr and stristr functions

The strstr( ) search is case-sensitive; the stristr( ) search isn't. If the needle isn't found in the haystack string, both strstr( ) and stristr( ) return false else returns the portion of string. The following examples show how the functions work:

$var = "To be or not to be";
print strstr($var, "to");    //  "to be"
print stristr($var, "to");   //  "To be or not to be"
print stristr($var, "oz");   // false

strchr function

This function is an alias of strstr().

strrchr function

strrchr returns the last occurrence of a character in a string

The strrchr( ) function returns the portion of haystack by searching for the single character needle; however, strrchr( ) returns the portion from the last occurrence of needle:

string strrchr(string haystack, string needle)

Unlike strstr( ) and stristr( ), strrchr( ) searches for only a single character, and only the first character of the needle string is used. The following examples show how strrchr( ) works:

$var = "To be or not to be";
// Prints: "not to be"
print strrchr($var, "n");
// Prints "o be": Only searches for "o" which
// is found at position 14
print strrchr($var, "oz");

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