Đầu ra của đoạn mã PHP sau PHP echo four4 three3 two2 1 sẽ là gì

I did a performance check, and I saw, if you push more than one value it can be faster the array push, that the normal $array[] version.

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Câu lệnh echo và print PHP
Tuyên bố tiếng vang PHP
1 câu trả lời
Trả lời câu hỏi này
Điều gì sẽ là đầu ra của mã PHP sau đây

Case 1: $array[] = something; Case 2: array_push($array, $value); Case 3: array_push($array, $value1, $value2, $value3 [...]); $values are definied Case 4: array_push($array, $value1, $value2, $value3 [...]); $values are definied, when $array is not empty Case 5: Case1 + Case 3 Case 6: Result array contains some value (Case 4) Case 7: Result array contains same value as the push array (Case 4) ----------------------------------------------------------------------------------------------------------- ~~~~~~~~~~~~ Case 1 ~~~~~~~~~~~~ Times: 0.0310 0.0300 0.0290 0.0340 0.0400 0.0440 0.0480 0.0550 0.0570 0.0570 Min: 0.0290 Max: 0.0570 Avg: 0.0425 ~~~~~~~~~~~~ Case 2 ~~~~~~~~~~~~ Times: 0.3890 0.3850 0.3770 0.4110 0.4020 0.3980 0.4020 0.4060 0.4130 0.4200 Min: 0.3770 Max: 0.4200 Avg: 0.4003 ~~~~~~~~~~~~ Case 3 ~~~~~~~~~~~~ Times: 0.0200 0.0220 0.0240 0.0340 0.0360 0.0410 0.0460 0.0500 0.0520 0.0520 Min: 0.0200 Max: 0.0520 Avg: 0.0377 ~~~~~~~~~~~~ Case 4 ~~~~~~~~~~~~ Times: 0.0200 0.0250 0.0230 0.0260 0.0330 0.0390 0.0460 0.0510 0.0520 0.0520 Min: 0.0200 Max: 0.0520 Avg: 0.0367 ~~~~~~~~~~~~ Case 5 ~~~~~~~~~~~~ Times: 0.0260 0.0250 0.0370 0.0360 0.0390 0.0440 0.0510 0.0520 0.0530 0.0560 Min: 0.0250 Max: 0.0560 Avg: 0.0419 ~~~~~~~~~~~~ Case 6 ~~~~~~~~~~~~ Times: 0.0340 0.0280 0.0370 0.0410 0.0450 0.0480 0.0560 0.0580 0.0580 0.0570 Min: 0.0280 Max: 0.0580 Avg: 0.0462 ~~~~~~~~~~~~ Case 7 ~~~~~~~~~~~~ Times: 0.0290 0.0270 0.0350 0.0410 0.0430 0.0470 0.0540 0.0540 0.0550 0.0550 Min: 0.0270 Max: 0.0550 Avg: 0.044

Tester code: // Case 1 $startTime = microtime(true); $array = array(); for ($x = 1; $x <= 100000; $x++) { $array[] = $x; } $endTime = microtime(true);

// Case 2 $startTime = microtime(true); $array = array(); for ($x = 1; $x <= 100000; $x++) { array_push($array, $x); } $endTime = microtime(true);

// Case 3 $result = array(); $array2 = array(&$result)+$array; $startTime = microtime(true); call_user_func_array("array_push", $array2); $endTime = microtime(true);

// Case 4 $result = array(); for ($x = 1; $x <= 100000; $x++) { $result[] = $x; } $array2 = array(&$result)+$array; $startTime = microtime(true); call_user_func_array("array_push", $array2); $endTime = microtime(true);

// Case 5 $result = array(); $startTime = microtime(true); $array = array(&$result); for ($x = 1; $x <= 100000; $x++) { $array[] = $x; } $endTime = microtime(true);

// Case 6 $result = array(1,2,3,4,5,6); $startTime = microtime(true); $array = array(&$result); for ($x = 1; $x <= 100000; $x++) { $array[] = $x; } $endTime = microtime(true);

________số 8

Trong hướng dẫn này, chúng tôi sử dụng echo hoặc Case 1: $array[] = something; Case 2: array_push($array, $value); Case 3: array_push($array, $value1, $value2, $value3 [...]); $values are definied Case 4: array_push($array, $value1, $value2, $value3 [...]); $values are definied, when $array is not empty Case 5: Case1 + Case 3 Case 6: Result array contains some value (Case 4) Case 7: Result array contains same value as the push array (Case 4) ----------------------------------------------------------------------------------------------------------- ~~~~~~~~~~~~ Case 1 ~~~~~~~~~~~~ Times: 0.0310 0.0300 0.0290 0.0340 0.0400 0.0440 0.0480 0.0550 0.0570 0.0570 Min: 0.0290 Max: 0.0570 Avg: 0.0425 ~~~~~~~~~~~~ Case 2 ~~~~~~~~~~~~ Times: 0.3890 0.3850 0.3770 0.4110 0.4020 0.3980 0.4020 0.4060 0.4130 0.4200 Min: 0.3770 Max: 0.4200 Avg: 0.4003 ~~~~~~~~~~~~ Case 3 ~~~~~~~~~~~~ Times: 0.0200 0.0220 0.0240 0.0340 0.0360 0.0410 0.0460 0.0500 0.0520 0.0520 Min: 0.0200 Max: 0.0520 Avg: 0.0377 ~~~~~~~~~~~~ Case 4 ~~~~~~~~~~~~ Times: 0.0200 0.0250 0.0230 0.0260 0.0330 0.0390 0.0460 0.0510 0.0520 0.0520 Min: 0.0200 Max: 0.0520 Avg: 0.0367 ~~~~~~~~~~~~ Case 5 ~~~~~~~~~~~~ Times: 0.0260 0.0250 0.0370 0.0360 0.0390 0.0440 0.0510 0.0520 0.0530 0.0560 Min: 0.0250 Max: 0.0560 Avg: 0.0419 ~~~~~~~~~~~~ Case 6 ~~~~~~~~~~~~ Times: 0.0340 0.0280 0.0370 0.0410 0.0450 0.0480 0.0560 0.0580 0.0580 0.0570 Min: 0.0280 Max: 0.0580 Avg: 0.0462 ~~~~~~~~~~~~ Case 7 ~~~~~~~~~~~~ Times: 0.0290 0.0270 0.0350 0.0410 0.0430 0.0470 0.0540 0.0540 0.0550 0.0550 Min: 0.0270 Max: 0.0550 Avg: 0.0440 trong hầu hết mọi ví dụ. Vì vậy, chương này chứa thêm một chút thông tin về hai câu lệnh đầu ra đó

Câu lệnh echo và print PHP

echo và Case 1: $array[] = something; Case 2: array_push($array, $value); Case 3: array_push($array, $value1, $value2, $value3 [...]); $values are definied Case 4: array_push($array, $value1, $value2, $value3 [...]); $values are definied, when $array is not empty Case 5: Case1 + Case 3 Case 6: Result array contains some value (Case 4) Case 7: Result array contains same value as the push array (Case 4) ----------------------------------------------------------------------------------------------------------- ~~~~~~~~~~~~ Case 1 ~~~~~~~~~~~~ Times: 0.0310 0.0300 0.0290 0.0340 0.0400 0.0440 0.0480 0.0550 0.0570 0.0570 Min: 0.0290 Max: 0.0570 Avg: 0.0425 ~~~~~~~~~~~~ Case 2 ~~~~~~~~~~~~ Times: 0.3890 0.3850 0.3770 0.4110 0.4020 0.3980 0.4020 0.4060 0.4130 0.4200 Min: 0.3770 Max: 0.4200 Avg: 0.4003 ~~~~~~~~~~~~ Case 3 ~~~~~~~~~~~~ Times: 0.0200 0.0220 0.0240 0.0340 0.0360 0.0410 0.0460 0.0500 0.0520 0.0520 Min: 0.0200 Max: 0.0520 Avg: 0.0377 ~~~~~~~~~~~~ Case 4 ~~~~~~~~~~~~ Times: 0.0200 0.0250 0.0230 0.0260 0.0330 0.0390 0.0460 0.0510 0.0520 0.0520 Min: 0.0200 Max: 0.0520 Avg: 0.0367 ~~~~~~~~~~~~ Case 5 ~~~~~~~~~~~~ Times: 0.0260 0.0250 0.0370 0.0360 0.0390 0.0440 0.0510 0.0520 0.0530 0.0560 Min: 0.0250 Max: 0.0560 Avg: 0.0419 ~~~~~~~~~~~~ Case 6 ~~~~~~~~~~~~ Times: 0.0340 0.0280 0.0370 0.0410 0.0450 0.0480 0.0560 0.0580 0.0580 0.0570 Min: 0.0280 Max: 0.0580 Avg: 0.0462 ~~~~~~~~~~~~ Case 7 ~~~~~~~~~~~~ Times: 0.0290 0.0270 0.0350 0.0410 0.0430 0.0470 0.0540 0.0540 0.0550 0.0550 Min: 0.0270 Max: 0.0550 Avg: 0.0440 ít nhiều giống nhau. Cả hai đều được sử dụng để xuất dữ liệu ra màn hình

Sự khác biệt là nhỏ. echo không có giá trị trả về trong khi Case 1: $array[] = something; Case 2: array_push($array, $value); Case 3: array_push($array, $value1, $value2, $value3 [...]); $values are definied Case 4: array_push($array, $value1, $value2, $value3 [...]); $values are definied, when $array is not empty Case 5: Case1 + Case 3 Case 6: Result array contains some value (Case 4) Case 7: Result array contains same value as the push array (Case 4) ----------------------------------------------------------------------------------------------------------- ~~~~~~~~~~~~ Case 1 ~~~~~~~~~~~~ Times: 0.0310 0.0300 0.0290 0.0340 0.0400 0.0440 0.0480 0.0550 0.0570 0.0570 Min: 0.0290 Max: 0.0570 Avg: 0.0425 ~~~~~~~~~~~~ Case 2 ~~~~~~~~~~~~ Times: 0.3890 0.3850 0.3770 0.4110 0.4020 0.3980 0.4020 0.4060 0.4130 0.4200 Min: 0.3770 Max: 0.4200 Avg: 0.4003 ~~~~~~~~~~~~ Case 3 ~~~~~~~~~~~~ Times: 0.0200 0.0220 0.0240 0.0340 0.0360 0.0410 0.0460 0.0500 0.0520 0.0520 Min: 0.0200 Max: 0.0520 Avg: 0.0377 ~~~~~~~~~~~~ Case 4 ~~~~~~~~~~~~ Times: 0.0200 0.0250 0.0230 0.0260 0.0330 0.0390 0.0460 0.0510 0.0520 0.0520 Min: 0.0200 Max: 0.0520 Avg: 0.0367 ~~~~~~~~~~~~ Case 5 ~~~~~~~~~~~~ Times: 0.0260 0.0250 0.0370 0.0360 0.0390 0.0440 0.0510 0.0520 0.0530 0.0560 Min: 0.0250 Max: 0.0560 Avg: 0.0419 ~~~~~~~~~~~~ Case 6 ~~~~~~~~~~~~ Times: 0.0340 0.0280 0.0370 0.0410 0.0450 0.0480 0.0560 0.0580 0.0580 0.0570 Min: 0.0280 Max: 0.0580 Avg: 0.0462 ~~~~~~~~~~~~ Case 7 ~~~~~~~~~~~~ Times: 0.0290 0.0270 0.0350 0.0410 0.0430 0.0470 0.0540 0.0540 0.0550 0.0550 Min: 0.0270 Max: 0.0550 Avg: 0.0440 có giá trị trả về là 1 nên có thể dùng trong biểu thức. echo có thể nhận nhiều tham số (mặc dù việc sử dụng như vậy rất hiếm) trong khi Case 1: $array[] = something; Case 2: array_push($array, $value); Case 3: array_push($array, $value1, $value2, $value3 [...]); $values are definied Case 4: array_push($array, $value1, $value2, $value3 [...]); $values are definied, when $array is not empty Case 5: Case1 + Case 3 Case 6: Result array contains some value (Case 4) Case 7: Result array contains same value as the push array (Case 4) ----------------------------------------------------------------------------------------------------------- ~~~~~~~~~~~~ Case 1 ~~~~~~~~~~~~ Times: 0.0310 0.0300 0.0290 0.0340 0.0400 0.0440 0.0480 0.0550 0.0570 0.0570 Min: 0.0290 Max: 0.0570 Avg: 0.0425 ~~~~~~~~~~~~ Case 2 ~~~~~~~~~~~~ Times: 0.3890 0.3850 0.3770 0.4110 0.4020 0.3980 0.4020 0.4060 0.4130 0.4200 Min: 0.3770 Max: 0.4200 Avg: 0.4003 ~~~~~~~~~~~~ Case 3 ~~~~~~~~~~~~ Times: 0.0200 0.0220 0.0240 0.0340 0.0360 0.0410 0.0460 0.0500 0.0520 0.0520 Min: 0.0200 Max: 0.0520 Avg: 0.0377 ~~~~~~~~~~~~ Case 4 ~~~~~~~~~~~~ Times: 0.0200 0.0250 0.0230 0.0260 0.0330 0.0390 0.0460 0.0510 0.0520 0.0520 Min: 0.0200 Max: 0.0520 Avg: 0.0367 ~~~~~~~~~~~~ Case 5 ~~~~~~~~~~~~ Times: 0.0260 0.0250 0.0370 0.0360 0.0390 0.0440 0.0510 0.0520 0.0530 0.0560 Min: 0.0250 Max: 0.0560 Avg: 0.0419 ~~~~~~~~~~~~ Case 6 ~~~~~~~~~~~~ Times: 0.0340 0.0280 0.0370 0.0410 0.0450 0.0480 0.0560 0.0580 0.0580 0.0570 Min: 0.0280 Max: 0.0580 Avg: 0.0462 ~~~~~~~~~~~~ Case 7 ~~~~~~~~~~~~ Times: 0.0290 0.0270 0.0350 0.0410 0.0430 0.0470 0.0540 0.0540 0.0550 0.0550 Min: 0.0270 Max: 0.0550 Avg: 0.0440 có thể nhận một tham số. echo nhanh hơn một chút so với Case 1: $array[] = something; Case 2: array_push($array, $value); Case 3: array_push($array, $value1, $value2, $value3 [...]); $values are definied Case 4: array_push($array, $value1, $value2, $value3 [...]); $values are definied, when $array is not empty Case 5: Case1 + Case 3 Case 6: Result array contains some value (Case 4) Case 7: Result array contains same value as the push array (Case 4) ----------------------------------------------------------------------------------------------------------- ~~~~~~~~~~~~ Case 1 ~~~~~~~~~~~~ Times: 0.0310 0.0300 0.0290 0.0340 0.0400 0.0440 0.0480 0.0550 0.0570 0.0570 Min: 0.0290 Max: 0.0570 Avg: 0.0425 ~~~~~~~~~~~~ Case 2 ~~~~~~~~~~~~ Times: 0.3890 0.3850 0.3770 0.4110 0.4020 0.3980 0.4020 0.4060 0.4130 0.4200 Min: 0.3770 Max: 0.4200 Avg: 0.4003 ~~~~~~~~~~~~ Case 3 ~~~~~~~~~~~~ Times: 0.0200 0.0220 0.0240 0.0340 0.0360 0.0410 0.0460 0.0500 0.0520 0.0520 Min: 0.0200 Max: 0.0520 Avg: 0.0377 ~~~~~~~~~~~~ Case 4 ~~~~~~~~~~~~ Times: 0.0200 0.0250 0.0230 0.0260 0.0330 0.0390 0.0460 0.0510 0.0520 0.0520 Min: 0.0200 Max: 0.0520 Avg: 0.0367 ~~~~~~~~~~~~ Case 5 ~~~~~~~~~~~~ Times: 0.0260 0.0250 0.0370 0.0360 0.0390 0.0440 0.0510 0.0520 0.0530 0.0560 Min: 0.0250 Max: 0.0560 Avg: 0.0419 ~~~~~~~~~~~~ Case 6 ~~~~~~~~~~~~ Times: 0.0340 0.0280 0.0370 0.0410 0.0450 0.0480 0.0560 0.0580 0.0580 0.0570 Min: 0.0280 Max: 0.0580 Avg: 0.0462 ~~~~~~~~~~~~ Case 7 ~~~~~~~~~~~~ Times: 0.0290 0.0270 0.0350 0.0410 0.0430 0.0470 0.0540 0.0540 0.0550 0.0550 Min: 0.0270 Max: 0.0550 Avg: 0.0440

Tuyên bố tiếng vang PHP

Câu lệnh echo có thể được sử dụng có hoặc không có dấu ngoặc đơn. echo hoặc Case 1: $array[] = something; Case 2: array_push($array, $value); Case 3: array_push($array, $value1, $value2, $value3 [...]); $values are definied Case 4: array_push($array, $value1, $value2, $value3 [...]); $values are definied, when $array is not empty Case 5: Case1 + Case 3 Case 6: Result array contains some value (Case 4) Case 7: Result array contains same value as the push array (Case 4) ----------------------------------------------------------------------------------------------------------- ~~~~~~~~~~~~ Case 1 ~~~~~~~~~~~~ Times: 0.0310 0.0300 0.0290 0.0340 0.0400 0.0440 0.0480 0.0550 0.0570 0.0570 Min: 0.0290 Max: 0.0570 Avg: 0.0425 ~~~~~~~~~~~~ Case 2 ~~~~~~~~~~~~ Times: 0.3890 0.3850 0.3770 0.4110 0.4020 0.3980 0.4020 0.4060 0.4130 0.4200 Min: 0.3770 Max: 0.4200 Avg: 0.4003 ~~~~~~~~~~~~ Case 3 ~~~~~~~~~~~~ Times: 0.0200 0.0220 0.0240 0.0340 0.0360 0.0410 0.0460 0.0500 0.0520 0.0520 Min: 0.0200 Max: 0.0520 Avg: 0.0377 ~~~~~~~~~~~~ Case 4 ~~~~~~~~~~~~ Times: 0.0200 0.0250 0.0230 0.0260 0.0330 0.0390 0.0460 0.0510 0.0520 0.0520 Min: 0.0200 Max: 0.0520 Avg: 0.0367 ~~~~~~~~~~~~ Case 5 ~~~~~~~~~~~~ Times: 0.0260 0.0250 0.0370 0.0360 0.0390 0.0440 0.0510 0.0520 0.0530 0.0560 Min: 0.0250 Max: 0.0560 Avg: 0.0419 ~~~~~~~~~~~~ Case 6 ~~~~~~~~~~~~ Times: 0.0340 0.0280 0.0370 0.0410 0.0450 0.0480 0.0560 0.0580 0.0580 0.0570 Min: 0.0280 Max: 0.0580 Avg: 0.0462 ~~~~~~~~~~~~ Case 7 ~~~~~~~~~~~~ Times: 0.0290 0.0270 0.0350 0.0410 0.0430 0.0470 0.0540 0.0540 0.0550 0.0550 Min: 0.0270 Max: 0.0550 Avg: 0.04404

Hiển thị văn bản

Ví dụ sau đây cho thấy cách xuất văn bản bằng lệnh Case 1: $array[] = something; Case 2: array_push($array, $value); Case 3: array_push($array, $value1, $value2, $value3 [...]); $values are definied Case 4: array_push($array, $value1, $value2, $value3 [...]); $values are definied, when $array is not empty Case 5: Case1 + Case 3 Case 6: Result array contains some value (Case 4) Case 7: Result array contains same value as the push array (Case 4) ----------------------------------------------------------------------------------------------------------- ~~~~~~~~~~~~ Case 1 ~~~~~~~~~~~~ Times: 0.0310 0.0300 0.0290 0.0340 0.0400 0.0440 0.0480 0.0550 0.0570 0.0570 Min: 0.0290 Max: 0.0570 Avg: 0.0425 ~~~~~~~~~~~~ Case 2 ~~~~~~~~~~~~ Times: 0.3890 0.3850 0.3770 0.4110 0.4020 0.3980 0.4020 0.4060 0.4130 0.4200 Min: 0.3770 Max: 0.4200 Avg: 0.4003 ~~~~~~~~~~~~ Case 3 ~~~~~~~~~~~~ Times: 0.0200 0.0220 0.0240 0.0340 0.0360 0.0410 0.0460 0.0500 0.0520 0.0520 Min: 0.0200 Max: 0.0520 Avg: 0.0377 ~~~~~~~~~~~~ Case 4 ~~~~~~~~~~~~ Times: 0.0200 0.0250 0.0230 0.0260 0.0330 0.0390 0.0460 0.0510 0.0520 0.0520 Min: 0.0200 Max: 0.0520 Avg: 0.0367 ~~~~~~~~~~~~ Case 5 ~~~~~~~~~~~~ Times: 0.0260 0.0250 0.0370 0.0360 0.0390 0.0440 0.0510 0.0520 0.0530 0.0560 Min: 0.0250 Max: 0.0560 Avg: 0.0419 ~~~~~~~~~~~~ Case 6 ~~~~~~~~~~~~ Times: 0.0340 0.0280 0.0370 0.0410 0.0450 0.0480 0.0560 0.0580 0.0580 0.0570 Min: 0.0280 Max: 0.0580 Avg: 0.0462 ~~~~~~~~~~~~ Case 7 ~~~~~~~~~~~~ Times: 0.0290 0.0270 0.0350 0.0410 0.0430 0.0470 0.0540 0.0540 0.0550 0.0550 Min: 0.0270 Max: 0.0550 Avg: 0.0440 (chú ý rằng văn bản có thể chứa đánh dấu HTML)