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1 --TEST--

2 Testing substr() function

3 --FILE--

4 <?php

6 /* Prototype: string substr( string str, int start[, int length] )

7 * Description: Returns the portion of string specified by the start and length parameters.

8 */

10 $strings_array = array( NULL, "", 12345, "abcdef", "123abc", "_123abc");

12 $counter = 1;

13 foreach ($strings_array as $str) {

14 /* variations with two arguments */

15 /* start values >, < and = 0 */

17 echo ("\n--- Iteration ".$counter." ---\n");

18 echo ("\n-- Variations for two arguments --\n");

19 var_dump ( substr($str, 1) );

20 var_dump ( substr($str, 0) );

21 var_dump ( substr($str, -2) );

23 /* variations with three arguments */

24 /* start value variations with length values */

26 echo ("\n-- Variations for three arguments --\n");

27 var_dump ( substr($str, 1, 3) );

28 var_dump ( substr($str, 1, 0) );

29 var_dump ( substr($str, 1, -3) );

30 var_dump ( substr($str, 0, 3) );

31 var_dump ( substr($str, 0, 0) );

32 var_dump ( substr($str, 0, -3) );

33 var_dump ( substr($str, -2, 3) );

34 var_dump ( substr($str, -2, 0 ) );

35 var_dump ( substr($str, -2, -3) );

37 $counter++;

38 }

40 /* variation of start and length to point to same element */

41 echo ("\n*** Testing for variations of start and length to point to same element ***\n");

42 var_dump (substr("abcde" , 2, -2) );

43 var_dump (substr("abcde" , -3, -2) );

45 /* Testing to return empty string when start denotes the position beyond the truncation (set by negative length) */

46 echo ("\n*** Testing for start > truncation ***\n");

47 var_dump (substr("abcdef" , 4, -4) );

49 /* String with null character */

50 echo ("\n*** Testing for string with null characters ***\n");

51 var_dump (substr("abc\x0xy\x0z" ,2) );

53 /* String with international characters */

54 echo ("\n*** Testing for string with international characters ***\n");

55 var_dump (substr('\xIñtërnâtiônàlizætiøn',3) );

57 /* start <0 && -start > length */

58 echo "\n*** Start before the first char ***\n";

59 var_dump (substr("abcd" , -8) );

61 /* Omitting length and passing a NULL length */

62 echo "\n*** Omitting length or using NULL length ***\n";

63 var_dump (substr("abcdef" , 2) );

64 var_dump (substr("abcdef" , 2, NULL) );

66 echo"\nDone";

68 ?>

69 --EXPECT--

70 --- Iteration 1 ---

72 -- Variations for two arguments --

73 bool(false)

74 string(0) ""

75 string(0) ""

77 -- Variations for three arguments --

78 bool(false)

79 bool(false)

80 bool(false)

81 string(0) ""

82 string(0) ""

83 bool(false)

84 string(0) ""

85 string(0) ""

86 bool(false)

88 --- Iteration 2 ---

90 -- Variations for two arguments --

91 bool(false)

92 string(0) ""

93 string(0) ""

95 -- Variations for three arguments --

96 bool(false)

97 bool(false)

98 bool(false)

99 string(0) ""

100 string(0) ""

101 bool(false)

102 string(0) ""

103 string(0) ""

104 bool(false)

105

106 --- Iteration 3 ---

107

108 -- Variations for two arguments --

109 string(4) "2345"

110 string(5) "12345"

111 string(2) "45"

112

113 -- Variations for three arguments --

114 string(3) "234"

115 string(0) ""

116 string(1) "2"

117 string(3) "123"

118 string(0) ""

119 string(2) "12"

120 string(2) "45"

121 string(0) ""

122 string(0) ""

123

124 --- Iteration 4 ---

125

126 -- Variations for two arguments --

127 string(5) "bcdef"

128 string(6) "abcdef"

129 string(2) "ef"

130

131 -- Variations for three arguments --

132 string(3) "bcd"

133 string(0) ""

134 string(2) "bc"

135 string(3) "abc"

136 string(0) ""

137 string(3) "abc"

138 string(2) "ef"

139 string(0) ""

140 string(0) ""

141

142 --- Iteration 5 ---

143

144 -- Variations for two arguments --

145 string(5) "23abc"

146 string(6) "123abc"

147 string(2) "bc"

148

149 -- Variations for three arguments --

150 string(3) "23a"

151 string(0) ""

152 string(2) "23"

153 string(3) "123"

154 string(0) ""

155 string(3) "123"

156 string(2) "bc"

157 string(0) ""

158 string(0) ""

159

160 --- Iteration 6 ---

161

162 -- Variations for two arguments --

163 string(6) "123abc"

164 string(7) "_123abc"

165 string(2) "bc"

166

167 -- Variations for three arguments --

168 string(3) "123"

169 string(0) ""

170 string(3) "123"

171 string(3) "_12"

172 string(0) ""

173 string(4) "_123"

174 string(2) "bc"

175 string(0) ""

176 string(0) ""

177

178 *** Testing for variations of start and length to point to same element ***

179 string(1) "c"

180 string(1) "c"

181

182 *** Testing for start > truncation ***

183 bool(false)

184

185 *** Testing for string with null characters ***

186 string(6) "c\0xy\0z"

187

188 *** Testing for string with international characters ***

189 string(26) "ñtërnâtiônàlizætiøn"

190

191 *** Start before the first char ***

192 string(4) "abcd"

193

194 *** Omitting length or using NULL length ***

195 string(4) "cdef"

196 string(4) "cdef"

197

198 Done