What is the use of strtok in PHP?

The strtok() function splits a string into smaller strings (tokens).

How do you write strtok?

Steps: Create a function strtok() which accepts string and delimiter as an argument and return char pointer. Create a static variable input to maintain the state of the string. Check if extracting the tokens for the first time then initialize the input with it.

How do you use strtok?

The strtok function is used to tokenize a string and thus separates it into multiple strings divided by a delimiter. The first call to strtok returns the pointer to the first substring. All the next calls with the first argument being NULL use the string passed at the first call and return the next substring.

What is the difference between explode () and strtok ()?

Functions like explode return the complete split string in an array. strtok on the other hand only returns one piece at a time, with each subsequent call returning the next piece.

Is strtok thread safe?

strtok is neither thread safe nor re-entrant because it uses a static buffer while parsing. This means that if a function calls strtok , no function that it calls while it is using strtok can also use strtok , and it cannot be called by any function that is itself using strtok .

Does strtok modify the original string?

Because strtok() modifies the initial string to be parsed, the string is subsequently unsafe and cannot be used in its original form. If you need to preserve the original string, copy it into a buffer and pass the address of the buffer to strtok() instead of the original string.

What is the difference between strtok and strtok_r?

strtok save static pointer for reuse in the next time, when you give NULL as the first parameter, so you just can’t parse 2 strings in parallel. In the strtok_r you give also the pointer, as out parameter (pointer to pointer).

What library is strtok in?

Description. The C library function char *strtok(char *str, const char *delim) breaks string str into a series of tokens using the delimiter delim.

Does strtok change the string?

When strtok() finds a token, it changes the character immediately after the token into a \0 , and then returns a pointer to the token. The next time you call it with a NULL argument, it starts looking after the separators that terminated the first token — i.e., after the \0 , and possibly further along.

Can you use strtok with multiple delimiters?

The function strtok breaks a string into a smaller strings, or tokens, using a set of delimiters. The string of delimiters may contain one or more delimiters and different delimiter strings may be used with each call to strtok .

What can I use instead of strtok?

Other functions are available for parsing strings:

1. strchr() locates a character in a string ;
2. strstr() locates a substring in a string ;
3. strspn() matches a set of characters at the beginning of a string ;
4. strcspn() matches the complement of a set of characters at the beginning of a string ;

Is strtok safe?

PHP strtok () is an in-built function of PHP, which is similar to the C strtok () function. It is used to tokenize or split a string into small parts of string on the basis of given delimiters. It takes input string as an argument along with the delimiters (as a second argument).

How do I use the string argument in strtok ()?

In the example below, note that it is only the first call to strtok () that uses the string argument. After the first call, this function only needs the split argument, as it keeps track of where it is in the current string. To tokenize a new string, call strtok () with the string argument again: $string = “Hello world. Beautiful day today.”;

How do you tokenize a string in PHP?

PHP String strtok () function PHP strtok () is an in-built function of PHP, which is similar to the C strtok () function. It is used to tokenize or split a string into small parts of string on the basis of given delimiters. It takes input string as an argument along with the delimiters (as a second argument).

Why does strtok () need the split argument?

After the first call, this function only needs the split argument, as it keeps track of where it is in the current string. To tokenize a new string, call strtok () with the string argument again: