我如何生成长的有效电子邮件地址？
我的意思是：
$ php -r 'var_dump(filter_var(str_repeat("a", 64) . "@gmail.com", FILTER_VALIDATE_EMAIL));'
Command line code:1:
string(74) "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa@gmail.com"
$ php -r 'var_dump(filter_var(str_repeat("a", 65) . "@gmail.com", FILTER_VALIDATE_EMAIL));'
Command line code:1:
bool(false)
邮箱名称的长度是否有限制？ 我需要长度超过255个字符的电子邮件（用于测试）。
UPD让我解释一下我需要这个。 我想确保在我的测试中用户不能指定超过255个字符的电子邮件地址。 这就是为什么我需要一个长的电子邮件地址。
UPD继Justinas建议：
$ php -r 'var_dump(filter_var(str_repeat("a", 64) . "@" . str_repeat("g", 63) . ".com", FILTER_VALIDATE_EMAIL));'
Command line code:1:
string(132) "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa@ggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggg.com"
$ php -r 'var_dump(filter_var(str_repeat("a", 64) . "@" . str_repeat("g", 64) . ".com", FILTER_VALIDATE_EMAIL));'
Command line code:1:
bool(false)
资源
电子邮件地址的格式是本地部分@域， 本地部分可能长达64个字符 ， 域可能最多255个字符
要生成一些长字符串，你可以使用像str_repeat这样简单的东西
var_dump(str_repeat('a', 64).'@'.str_repeat('g', 255).'.com');
您可以使用此功能来生成符合最多64个字符本地部分和最多255个字符域部分的随机电子邮件地址。
<?php
function generateEmailAddress($maxLenLocal=64, $maxLenDomain=255){
$numeric = '0123456789';
$alphabetic = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
$extras = '.-_';
$all = $numeric . $alphabetic . $extras;
$alphaNumeric = $alphabetic . $numeric;
$alphaNumericP = $alphabetic . $numeric . "-";
$randomString = '';
// GENERATE 1ST 4 CHARACTERS OF THE LOCAL-PART
for ($i = 0; $i < 4; $i++) {
$randomString .= $alphabetic[rand(0, strlen($alphabetic) - 1)];
}
// GENERATE A NUMBER BETWEEN 20 & 60
$rndNum = rand(20, $maxLenLocal-4);
for ($i = 0; $i < $rndNum; $i++) {
$randomString .= $all[rand(0, strlen($all) - 1)];
}
// ADD AN @ SYMBOL...
$randomString .= "@";
// GENERATE DOMAIN NAME - INITIAL 3 CHARS:
for ($i = 0; $i < 3; $i++) {
$randomString .= $alphabetic[rand(0, strlen($alphabetic) - 1)];
}
// GENERATE A NUMBER BETWEEN 15 & $maxLenDomain-7
$rndNum2 = rand(15, $maxLenDomain-7);
for ($i = 0; $i < $rndNum2; $i++) {
$randomString .= $all[rand(0, strlen($all) - 1)];
}
// ADD AN DOT . SYMBOL...
$randomString .= ".";
// GENERATE TLD: 4
for ($i = 0; $i < 4; $i++) {
$randomString .= $alphaNumeric[rand(0, strlen($alphaNumeric) - 1)];
}
return $randomString;
}
var_dump(generateEmailAddress());
var_dump(generateEmailAddress());
var_dump(generateEmailAddress());
var_dump(generateEmailAddress());
var_dump(generateEmailAddress());
var_dump(generateEmailAddress());
var_dump(generateEmailAddress());
var_dump(generateEmailAddress());
var_dump(generateEmailAddress());
var_dump(generateEmailAddress());
var_dump(generateEmailAddress());
从Justinas的链接中引用更多：
电子邮件地址的格式是本地部分@域，其中本地部分 最长可达64个字符 ， 域 最多可以有255个字符，但正向或反向路径的最大长度为256个字符限制整个域电子邮件地址 不超过254个字符 。
现在，如果我们看一下filter_var的来源，我们会看到基本上有两个检查：
FILTER_FLAG_EMAIL_UNICODE标志） 正则表达式可以改写如下：
/^
### check if total length is no more than 254 symbols
(?!
(?:
(?:x22?x5C[x00-x7E]x22?)
|
(?:x22?[^x5Cx22]x22?)
){255,}
)
### check if the part before @ is no more than 64 symbols
(?!
(?:
(?:x22?x5C[x00-x7E]x22?)
|
(?:x22?[^x5Cx22]x22?)
){65,}
@
)
(?:
(?:[x21x23-x27x2Ax2Bx2Dx2F-x39x3Dx3Fx5E-x7E]+)
|
(?:x22(?:[x01-x08x0Bx0Cx0E-x1Fx21x23-x5Bx5D-x7F]|(?:x5C[x00-x7F]))*x22)
)
(?:
.
(?:
(?:[x21x23-x27x2Ax2Bx2Dx2F-x39x3Dx3Fx5E-x7E]+)
|
(?:
x22
(?:
[x01-x08x0Bx0Cx0E-x1Fx21x23-x5Bx5D-x7F]
|
(?:x5C[x00-x7F])
)*
x22
)
)
)*
@
(?:
(?:
### no segment must be longer than 64 symbols
(?!.*[^.]{64,})
(?:
(?:
(?:xn--)?
[a-z0-9]+
(?:-+[a-z0-9]+)*
.
){1,126}
){1,}
(?:
(?:[a-z][a-z0-9]*)
|
(?:(?:xn--)[a-z0-9]+)
)
(?:-+[a-z0-9]+)*
)
|
### ip
(?:
[
(?:
(?:
IPv6:
(?:
(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){7})
|
(?:
(?!(?:.*[a-f0-9][:]]){7,})
(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?
::
(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?
)
)
)
|
(?:
(?:
IPv6:
(?:
(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){5}:)
|
(?:
(?!(?:.*[a-f0-9]:){5,})
(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3})?
::
(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3}:)?
)
)
)?
(?:
(?:25[0-5])
|
(?:2[0-4][0-9])
|
(?:1[0-9]{2})
|
(?:[1-9]?[0-9])
)
(?:
.
(?:
(?:25[0-5])
|
(?:2[0-4][0-9])
|
(?:1[0-9]{2})
|
(?:[1-9]?[0-9])
)
){3}
)
)
]
)
)
$/iD
知道我们能得到的最好的是：
$ php -r 'var_dump(filter_var(str_repeat("a", 64) . "@" . str_repeat(str_repeat("g", 63) . ".", 2) . str_repeat("g", 61), FILTER_VALIDATE_EMAIL));'
Command line code:1:
string(254) "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa@ggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggg.ggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggg.ggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggg"
$ php -r 'var_dump(filter_var(str_repeat("a", 64) . "@" . str_repeat(str_repeat("g", 63) . ".", 2) . str_repeat("g", 62), FILTER_VALIDATE_EMAIL));'
Command line code:1:
bool(false)
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