1--TEST-- 2Test strtr() function : usage variations - empty string & null for 'str' argument 3--FILE-- 4<?php 5/* Testing strtr() function by passing the 6 * empty string & null for 'str' argument and 7 * corresponding translation pair of chars for 'from', 'to' & 'replace_pairs' arguments 8*/ 9 10echo "*** Testing strtr() : empty string & null for 'str' arg ***\n"; 11/* definitions of required input variables */ 12$count = 1; 13 14$heredoc_str = <<<EOD 15 16EOD; 17 18//array of string inputs for $str 19$str_arr = array( 20 "", 21 '', 22 NULL, 23 null, 24 FALSE, 25 false, 26 $heredoc_str 27); 28 29$from = ""; 30$to = "TEST"; 31$replace_pairs = array("" => "t", '' => "TEST"); 32 33 34/* loop through to test strtr() with each element of $str_arr */ 35for($index = 0; $index < count($str_arr); $index++) { 36 echo "-- Iteration $count --\n"; 37 38 $str = $str_arr[$index]; //getting the array element in 'str' variable 39 40 //strtr() call in three args syntax form 41 var_dump( strtr($str, $from, $to) ); 42 43 //strtr() call in two args syntax form 44 var_dump( strtr($str, $replace_pairs) ); 45 46 $count++; 47} 48echo "*** Done ***"; 49?> 50--EXPECT-- 51*** Testing strtr() : empty string & null for 'str' arg *** 52-- Iteration 1 -- 53string(0) "" 54string(0) "" 55-- Iteration 2 -- 56string(0) "" 57string(0) "" 58-- Iteration 3 -- 59string(0) "" 60string(0) "" 61-- Iteration 4 -- 62string(0) "" 63string(0) "" 64-- Iteration 5 -- 65string(0) "" 66string(0) "" 67-- Iteration 6 -- 68string(0) "" 69string(0) "" 70-- Iteration 7 -- 71string(0) "" 72string(0) "" 73*** Done *** 74