xref: /PHP-8.4/tests/lang/foreachLoop.012.phpt (revision f8d79582) 
1--TEST--
2Directly modifying an unreferenced array when foreach'ing over it.
3--FILE--
4<?php
5
6define('MAX_LOOPS',5);
7
8function withRefValue($elements, $transform) {
9    echo "\n---( Array with $elements element(s): )---\n";
10    //Build array:
11    for ($i=0; $i<$elements; $i++) {
12        $a[] = "v.$i";
13    }
14    $counter=0;
15
16    echo "--> State of array before loop:\n";
17    var_dump($a);
18
19    echo "--> Do loop:\n";
20    foreach ($a as $k=>$v) {
21        echo "     iteration $counter:  \$k=$k; \$v=$v\n";
22        eval($transform);
23        $counter++;
24        if ($counter>MAX_LOOPS) {
25            echo "  ** Stuck in a loop! **\n";
26            break;
27        }
28    }
29
30    echo "--> State of array after loop:\n";
31    var_dump($a);
32}
33
34
35echo "\nPopping elements off end of an unreferenced array";
36$transform = 'array_pop($a);';
37withRefValue(1, $transform);
38withRefValue(2, $transform);
39withRefValue(3, $transform);
40withRefValue(4, $transform);
41
42echo "\n\n\nShift elements off start of an unreferenced array";
43$transform = 'array_shift($a);';
44withRefValue(1, $transform);
45withRefValue(2, $transform);
46withRefValue(3, $transform);
47withRefValue(4, $transform);
48
49echo "\n\n\nRemove current element of an unreferenced array";
50$transform = 'unset($a[$k]);';
51withRefValue(1, $transform);
52withRefValue(2, $transform);
53withRefValue(3, $transform);
54withRefValue(4, $transform);
55
56echo "\n\n\nAdding elements to the end of an unreferenced array";
57$transform = 'array_push($a, "new.$counter");';
58withRefValue(1, $transform);
59withRefValue(2, $transform);
60withRefValue(3, $transform);
61withRefValue(4, $transform);
62
63echo "\n\n\nAdding elements to the start of an unreferenced array";
64$transform = 'array_unshift($a, "new.$counter");';
65withRefValue(1, $transform);
66withRefValue(2, $transform);
67withRefValue(3, $transform);
68withRefValue(4, $transform);
69
70?>
71--EXPECT--
72Popping elements off end of an unreferenced array
73---( Array with 1 element(s): )---
74--> State of array before loop:
75array(1) {
76  [0]=>
77  string(3) "v.0"
78}
79--> Do loop:
80     iteration 0:  $k=0; $v=v.0
81--> State of array after loop:
82array(0) {
83}
84
85---( Array with 2 element(s): )---
86--> State of array before loop:
87array(2) {
88  [0]=>
89  string(3) "v.0"
90  [1]=>
91  string(3) "v.1"
92}
93--> Do loop:
94     iteration 0:  $k=0; $v=v.0
95     iteration 1:  $k=1; $v=v.1
96--> State of array after loop:
97array(0) {
98}
99
100---( Array with 3 element(s): )---
101--> State of array before loop:
102array(3) {
103  [0]=>
104  string(3) "v.0"
105  [1]=>
106  string(3) "v.1"
107  [2]=>
108  string(3) "v.2"
109}
110--> Do loop:
111     iteration 0:  $k=0; $v=v.0
112     iteration 1:  $k=1; $v=v.1
113     iteration 2:  $k=2; $v=v.2
114--> State of array after loop:
115array(0) {
116}
117
118---( Array with 4 element(s): )---
119--> State of array before loop:
120array(4) {
121  [0]=>
122  string(3) "v.0"
123  [1]=>
124  string(3) "v.1"
125  [2]=>
126  string(3) "v.2"
127  [3]=>
128  string(3) "v.3"
129}
130--> Do loop:
131     iteration 0:  $k=0; $v=v.0
132     iteration 1:  $k=1; $v=v.1
133     iteration 2:  $k=2; $v=v.2
134     iteration 3:  $k=3; $v=v.3
135--> State of array after loop:
136array(0) {
137}
138
139
140
141Shift elements off start of an unreferenced array
142---( Array with 1 element(s): )---
143--> State of array before loop:
144array(1) {
145  [0]=>
146  string(3) "v.0"
147}
148--> Do loop:
149     iteration 0:  $k=0; $v=v.0
150--> State of array after loop:
151array(0) {
152}
153
154---( Array with 2 element(s): )---
155--> State of array before loop:
156array(2) {
157  [0]=>
158  string(3) "v.0"
159  [1]=>
160  string(3) "v.1"
161}
162--> Do loop:
163     iteration 0:  $k=0; $v=v.0
164     iteration 1:  $k=1; $v=v.1
165--> State of array after loop:
166array(0) {
167}
168
169---( Array with 3 element(s): )---
170--> State of array before loop:
171array(3) {
172  [0]=>
173  string(3) "v.0"
174  [1]=>
175  string(3) "v.1"
176  [2]=>
177  string(3) "v.2"
178}
179--> Do loop:
180     iteration 0:  $k=0; $v=v.0
181     iteration 1:  $k=1; $v=v.1
182     iteration 2:  $k=2; $v=v.2
183--> State of array after loop:
184array(0) {
185}
186
187---( Array with 4 element(s): )---
188--> State of array before loop:
189array(4) {
190  [0]=>
191  string(3) "v.0"
192  [1]=>
193  string(3) "v.1"
194  [2]=>
195  string(3) "v.2"
196  [3]=>
197  string(3) "v.3"
198}
199--> Do loop:
200     iteration 0:  $k=0; $v=v.0
201     iteration 1:  $k=1; $v=v.1
202     iteration 2:  $k=2; $v=v.2
203     iteration 3:  $k=3; $v=v.3
204--> State of array after loop:
205array(0) {
206}
207
208
209
210Remove current element of an unreferenced array
211---( Array with 1 element(s): )---
212--> State of array before loop:
213array(1) {
214  [0]=>
215  string(3) "v.0"
216}
217--> Do loop:
218     iteration 0:  $k=0; $v=v.0
219--> State of array after loop:
220array(0) {
221}
222
223---( Array with 2 element(s): )---
224--> State of array before loop:
225array(2) {
226  [0]=>
227  string(3) "v.0"
228  [1]=>
229  string(3) "v.1"
230}
231--> Do loop:
232     iteration 0:  $k=0; $v=v.0
233     iteration 1:  $k=1; $v=v.1
234--> State of array after loop:
235array(0) {
236}
237
238---( Array with 3 element(s): )---
239--> State of array before loop:
240array(3) {
241  [0]=>
242  string(3) "v.0"
243  [1]=>
244  string(3) "v.1"
245  [2]=>
246  string(3) "v.2"
247}
248--> Do loop:
249     iteration 0:  $k=0; $v=v.0
250     iteration 1:  $k=1; $v=v.1
251     iteration 2:  $k=2; $v=v.2
252--> State of array after loop:
253array(0) {
254}
255
256---( Array with 4 element(s): )---
257--> State of array before loop:
258array(4) {
259  [0]=>
260  string(3) "v.0"
261  [1]=>
262  string(3) "v.1"
263  [2]=>
264  string(3) "v.2"
265  [3]=>
266  string(3) "v.3"
267}
268--> Do loop:
269     iteration 0:  $k=0; $v=v.0
270     iteration 1:  $k=1; $v=v.1
271     iteration 2:  $k=2; $v=v.2
272     iteration 3:  $k=3; $v=v.3
273--> State of array after loop:
274array(0) {
275}
276
277
278
279Adding elements to the end of an unreferenced array
280---( Array with 1 element(s): )---
281--> State of array before loop:
282array(1) {
283  [0]=>
284  string(3) "v.0"
285}
286--> Do loop:
287     iteration 0:  $k=0; $v=v.0
288--> State of array after loop:
289array(2) {
290  [0]=>
291  string(3) "v.0"
292  [1]=>
293  string(5) "new.0"
294}
295
296---( Array with 2 element(s): )---
297--> State of array before loop:
298array(2) {
299  [0]=>
300  string(3) "v.0"
301  [1]=>
302  string(3) "v.1"
303}
304--> Do loop:
305     iteration 0:  $k=0; $v=v.0
306     iteration 1:  $k=1; $v=v.1
307--> State of array after loop:
308array(4) {
309  [0]=>
310  string(3) "v.0"
311  [1]=>
312  string(3) "v.1"
313  [2]=>
314  string(5) "new.0"
315  [3]=>
316  string(5) "new.1"
317}
318
319---( Array with 3 element(s): )---
320--> State of array before loop:
321array(3) {
322  [0]=>
323  string(3) "v.0"
324  [1]=>
325  string(3) "v.1"
326  [2]=>
327  string(3) "v.2"
328}
329--> Do loop:
330     iteration 0:  $k=0; $v=v.0
331     iteration 1:  $k=1; $v=v.1
332     iteration 2:  $k=2; $v=v.2
333--> State of array after loop:
334array(6) {
335  [0]=>
336  string(3) "v.0"
337  [1]=>
338  string(3) "v.1"
339  [2]=>
340  string(3) "v.2"
341  [3]=>
342  string(5) "new.0"
343  [4]=>
344  string(5) "new.1"
345  [5]=>
346  string(5) "new.2"
347}
348
349---( Array with 4 element(s): )---
350--> State of array before loop:
351array(4) {
352  [0]=>
353  string(3) "v.0"
354  [1]=>
355  string(3) "v.1"
356  [2]=>
357  string(3) "v.2"
358  [3]=>
359  string(3) "v.3"
360}
361--> Do loop:
362     iteration 0:  $k=0; $v=v.0
363     iteration 1:  $k=1; $v=v.1
364     iteration 2:  $k=2; $v=v.2
365     iteration 3:  $k=3; $v=v.3
366--> State of array after loop:
367array(8) {
368  [0]=>
369  string(3) "v.0"
370  [1]=>
371  string(3) "v.1"
372  [2]=>
373  string(3) "v.2"
374  [3]=>
375  string(3) "v.3"
376  [4]=>
377  string(5) "new.0"
378  [5]=>
379  string(5) "new.1"
380  [6]=>
381  string(5) "new.2"
382  [7]=>
383  string(5) "new.3"
384}
385
386
387
388Adding elements to the start of an unreferenced array
389---( Array with 1 element(s): )---
390--> State of array before loop:
391array(1) {
392  [0]=>
393  string(3) "v.0"
394}
395--> Do loop:
396     iteration 0:  $k=0; $v=v.0
397--> State of array after loop:
398array(2) {
399  [0]=>
400  string(5) "new.0"
401  [1]=>
402  string(3) "v.0"
403}
404
405---( Array with 2 element(s): )---
406--> State of array before loop:
407array(2) {
408  [0]=>
409  string(3) "v.0"
410  [1]=>
411  string(3) "v.1"
412}
413--> Do loop:
414     iteration 0:  $k=0; $v=v.0
415     iteration 1:  $k=1; $v=v.1
416--> State of array after loop:
417array(4) {
418  [0]=>
419  string(5) "new.1"
420  [1]=>
421  string(5) "new.0"
422  [2]=>
423  string(3) "v.0"
424  [3]=>
425  string(3) "v.1"
426}
427
428---( Array with 3 element(s): )---
429--> State of array before loop:
430array(3) {
431  [0]=>
432  string(3) "v.0"
433  [1]=>
434  string(3) "v.1"
435  [2]=>
436  string(3) "v.2"
437}
438--> Do loop:
439     iteration 0:  $k=0; $v=v.0
440     iteration 1:  $k=1; $v=v.1
441     iteration 2:  $k=2; $v=v.2
442--> State of array after loop:
443array(6) {
444  [0]=>
445  string(5) "new.2"
446  [1]=>
447  string(5) "new.1"
448  [2]=>
449  string(5) "new.0"
450  [3]=>
451  string(3) "v.0"
452  [4]=>
453  string(3) "v.1"
454  [5]=>
455  string(3) "v.2"
456}
457
458---( Array with 4 element(s): )---
459--> State of array before loop:
460array(4) {
461  [0]=>
462  string(3) "v.0"
463  [1]=>
464  string(3) "v.1"
465  [2]=>
466  string(3) "v.2"
467  [3]=>
468  string(3) "v.3"
469}
470--> Do loop:
471     iteration 0:  $k=0; $v=v.0
472     iteration 1:  $k=1; $v=v.1
473     iteration 2:  $k=2; $v=v.2
474     iteration 3:  $k=3; $v=v.3
475--> State of array after loop:
476array(8) {
477  [0]=>
478  string(5) "new.3"
479  [1]=>
480  string(5) "new.2"
481  [2]=>
482  string(5) "new.1"
483  [3]=>
484  string(5) "new.0"
485  [4]=>
486  string(3) "v.0"
487  [5]=>
488  string(3) "v.1"
489  [6]=>
490  string(3) "v.2"
491  [7]=>
492  string(3) "v.3"
493}
494