String Searching Functions

String Searching Functions
strchr()
This function is the same as strstr().
strcspn()
int strcspn(string $sSearched, string $sForbidden, integer $iStart = 0, integer $iLength = infinite)
This function returns length of the string $sSearched that contains only the characters not in $sForbidden, starting at $iStart and continuing for $iLength characters. This version is case-sensitive.
Argument	Description
string $sSearched	This is a string that will be searched.
string $sForbidden	This string is the set of characters that we disallow inside $sSearched.
integer $iStart	This starting position for the search.
integer $iLength	This determines how many characters are searched.
stripos()
int stripos(string $sSearched, string $sPattern, int $iInitial = 0)
This function returns the position of the first instance of $sPattern inside of $sSearched that comes after $iInitial. If no instance is found, the function returns FALSE. This version is case-insensitive.
Argument	Description
string $sSearched	This is a string that will be searched.
string $sPattern	This string is the pattern that we are searching for inside $sSearched.
int $iInitial	This is the starting location of the search. A negative value can be used to start searching from the end of the string.
stristr()
string stristr(string $sSearched, string $sPattern, bool $bReturnInitial = false)
This function returns portion of the string $sSearched from the point where $sPattern is found in it to the end. If $bReturnInitial is false, the function returns the portion before the pattern is found. If no instance is found, the function returns FALSE. This version is case-insensitive.
Argument	Description
string $sSearched	This is a string that will be searched.
string $sPattern	This string is the pattern that we are searching for inside $sSearched.
bool $bReturnInitial	This determines whether the function returns the portion of the $sSearched before $sPattern or from $sPattern to the end.
strpbrk()
string strpbrk(string $sSearched, string $sCharSet)
This function returns portion of the string $sSearched from the point where one of the characters in $sCharSet is found in it to the end. If no instance is found, the function returns FALSE. This version is case-sensitive.
Argument	Description
string $sSearched	This is a string that will be searched.
string $sCharSet	This string is the set of characters that we are searching for inside $sSearched.
strpos()
int strpos(string $sSearched, string $sPattern, int $iInitial = 0)
This function returns the position of the first instance of $sPattern inside of $sSearched that comes after $iInitial. If no instance is found, the function returns FALSE. This version is case-sensitive.
Argument	Description
string $sSearched	This is a string that will be searched.
string $sPattern	This string is the pattern that wee are searching for inside $sSearched.
int $iInitial	This is the starting location of the search. A negative value can be used to start searching from the end of the string.
strrchr()
string strrchr(string $sSearched, string $sCharacter)
This function returns the portion of $sSearched from the first instance of $sCharacter to the end with the search starting at the end. If no instance is found, the function returns FALSE. This version is case-sensitive.
Argument	Description
string $sSearched	This is a string that will be searched.
string $sCharacter	This string is the character that we are searching for inside $sSearched.
strripos()
int strripos(string $sSearched, string $sPattern, int $iInitial = 0)
This function returns the position of the last instance of $sPattern inside of $sSearched that comes after $iInitial. If no instance is found, the function returns FALSE. This version is case-insensitive.
Argument	Description
string $sSearched	This is a string that will be searched.
string $sPattern	This string is the pattern that we are searching for inside $sSearched.
int $iInitial	This is the starting location of the search. A negative value can be used to start searching from the end of the string.
strpos()
int strrpos(string $sSearched, string $sPattern, int $iInitial = 0)
This function returns the position of the last instance of $sPattern inside of $sSearched that comes after $iInitial. If no instance is found, the function returns FALSE. This version is case-sensitive.
Argument	Description
string $sSearched	This is a string that will be searched.
string $sPattern	This string is the pattern that we are searching for inside $sSearched.
int $iInitial	This is the starting location of the search. A negative value can be used to start searching from the end of the string.
strspn()
int strspn(string $sSearched, string $sCharSet, integer $iStart = 0, integer $iLength = infinite)
This function returns length of the string $sSearched that contains only the characters in $sCharSet, starting at $iStart and continuing for $iLength characters. This version is case-sensitive.
Argument	Description
string $sSearched	This is a string that will be searched.
string $sCharSet	This string is the set of characters that we are searching for inside $sSearched.
integer $iStart	This starting position for the search.
integer $iLength	This determines how many characters are searched.
strstr()
string stristr(string $sSearched, string $sPattern, bool $bReturnInitial = false)
This function returns portion of the string $sSearched from the point where $sPattern is found in it to the end. If $bReturnInitial is false, the function returns the portion before the pattern is found. If no instance is found, the function returns FALSE. This version is case-sensitive.
Argument	Description
string $sSearched	This is a string that will be searched.
string $sPattern	This string is the pattern that we are searching for inside $sSearched.
bool $bReturnInitial	This determines whether the function returns the portion of the $sSearched before $sPattern or from $sPattern to the end.
substr_count()
int substr_count(string $sSearched, string $sPattern, integer $iStart = 0, integer $iLength = infinite)
This function returns number of times that $sPattern is found in the string $sSearched, starting at $iStart and continuing for $iLength characters. This version is case-sensitive.
Argument	Description
string $sSearched	This is a string that will be searched.
string $sPattern	This string is the pattern that we are searching for inside $sSearched.
integer $iStart	This starting position for the search. This value can be negative to indicate a postion from the end.
integer $iLength	This determines how many characters are searched. This value can be negative to indicate a search in the reverse direction.