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？我需要一封超过255个字符的电子邮件（用于测试）。
UPD 让我解释一下我的需要。我想在我的测试中确保用户无法指定长度超过255个字符的电子邮件地址。这就是为什么我需要一个很长的电子邮件地址。
UPD 遵循Justinas的建议：
$ 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)
答案 0 :(得分：1)
电子邮件地址的格式为local-part @ domain，其中本地部分最长可达64个字符，域最多可以 255个字符
要生成一些长字符串，您可以使用像str_repeat
var_dump(str_repeat('a', 64).'@'.str_repeat('g', 255).'.com');
答案 1 :(得分：1)
您可以使用此功能生成符合最多64个字符的本地部分和最多255个字符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());
答案 2 :(得分：1)
引用the link Justinas提供的更多内容：
电子邮件地址的格式为local-part @ domain，其中本地部分可能最多64个字符，域可能最多255个字符 - 但正向或反向路径的最大256个字符长度限制整个电子邮件地址 不超过254个字符长
现在，如果我们查看filter_var的{{3}}，我们会看到基本上有两张支票：
FILTER_FLAG_EMAIL_UNICODE标志）正则表达式可以重写如下：
/^
### check if total length is no more than 254 symbols
(?!
(?:
(?:\\x22?\\x5C[\\x00-\\x7E]\\x22?)
|
(?:\\x22?[^\\x5C\\x22]\\x22?)
){255,}
)
### check if the part before @ is no more than 64 symbols
(?!
(?:
(?:\\x22?\\x5C[\\x00-\\x7E]\\x22?)
|
(?:\\x22?[^\\x5C\\x22]\\x22?)
){65,}
@
)
(?:
(?:[\\x21\\x23-\\x27\\x2A\\x2B\\x2D\\x2F-\\x39\\x3D\\x3F\\x5E-\\x7E]+)
|
(?:\\x22(?:[\\x01-\\x08\\x0B\\x0C\\x0E-\\x1F\\x21\\x23-\\x5B\\x5D-\\x7F]|(?:\\x5C[\\x00-\\x7F]))*\\x22)
)
(?:
\\.
(?:
(?:[\\x21\\x23-\\x27\\x2A\\x2B\\x2D\\x2F-\\x39\\x3D\\x3F\\x5E-\\x7E]+)
|
(?:
\\x22
(?:
[\\x01-\\x08\\x0B\\x0C\\x0E-\\x1F\\x21\\x23-\\x5B\\x5D-\\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结果是：
$ 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)