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|
--TEST--
Test strncmp() function : usage variations - binary safe(binary values)
--FILE--
<?php
/* Prototype : int strncmp ( string $str1, string $str2, int $len );
* Description: Binary safe case-sensitive string comparison of the first n characters
* Source code: Zend/zend_builtin_functions.c
*/
/* Test strncmp() function with binary values passed to 'str1' & 'str2' and with the null terminated strings */
echo "*** Test strncmp() function: with binary inputs ***\n";
echo "\n-- Checking with all 256 characters given, in binary format --\n";
/* A binary function should work with all 256 characters that a character(8-bit) can take */
/* loop through to get all 256 character's equivalent binary value, and check working of strncmp() */
$count = 1;
for($ASCII = 0; $ASCII <= 255; $ASCII++) {
$str1 = decbin($ASCII); //ASCII value in binary form
$str2 = decbin( ord( chr($ASCII) ) ); //Getting equivalent ASCII value for the character in binary form
echo "-- Iteration $count --\n";
var_dump( strncmp($str1, $str2, 8) ); //comparing all the 8-bits; expected: int(0)
var_dump( strncmp($str1, $str2, 4) ); //comparing only 4-bits; expected: int(0)
$count++;
}
echo "\n-- Checking with out of character's range, given in binary format --\n";
/* Checking with the out of range ASCII value(given in binary format) */
$str1 = decbin(256);
$str2 = decbin( ord( chr(256) ));
var_dump( strncmp($str1, $str2, 8) ); //comparing all the 8-bits; expected: int(1)
echo "\n*** Done ***\n";
?>
--EXPECTF--
*** Test strncmp() function: with binary inputs ***
-- Checking with all 256 characters given, in binary format --
-- Iteration 1 --
int(0)
int(0)
-- Iteration 2 --
int(0)
int(0)
-- Iteration 3 --
int(0)
int(0)
-- Iteration 4 --
int(0)
int(0)
-- Iteration 5 --
int(0)
int(0)
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int(0)
int(0)
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int(0)
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int(0)
int(0)
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int(0)
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int(0)
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int(0)
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int(0)
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int(0)
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int(0)
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-- Iteration 256 --
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-- Checking with out of character's range, given in binary format --
int(1)
*** Done ***
|
