Core Function StrCSpn

StrCSpn( <subject>, <mask>, <start>, <length> )

Description

Find length of initial segment not matching mask.

Parameters

subject

The string to examine.

mask

The list of characters to ignore (as a string).

start

The position in subject to start searching.

If start is given and is non-negative, then strcspn() will begin examining subject at the start'th position.

For instance, in the string 'abcdef', the character at position 0 is 'a', the character at position 2 is 'c', and so forth.

If start is given and is negative, then strcspn() will begin examining subject at the start'th position from the end of subject.

length

The length of the segment from subject to examine.

If length is given and is non-negative, then subject will be examined for length characters after the starting position.

If lengthis given and is negative, then subject will be examined from the starting position up to length characters from the end of subject.

Return Value

Success: Returns the length of the segment as an integer.

Failure: Returns null

Remarks

None.

Example

say strcspn('abcd',  'apple'); // 0
say strcspn('abcd',  'banana'); // 0
say strcspn('hello', 'l'); // 2
say strcspn('hello', 'world'); // 2

Check if file names don't contain any forbidden characters

checkFilename("Moo.txt");
checkFilename("Cat:.txt");
 
Function checkFilename($filename)
{
	$forbidden= @"\?*:/@|<"">";
	if (strlen($filename) != strcspn($filename,$forbidden))
		echo "you cant create a file with that name!\n";
	else
		echo "That file name is fine\n";
}