你如何在 PHP 中提取字符串的前 100 个字符
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How do you pull first 100 characters of a string in PHP
提问by JoshFinnie
I am looking for a way to pull the first 100 characters from a string variable to put in another variable for printing.
我正在寻找一种从字符串变量中提取前 100 个字符以放入另一个变量进行打印的方法。
Is there a function that can do this easily?
有没有可以轻松做到这一点的功能？
For example:
例如：
$string1 = "I am looking for a way to pull the first 100 characters from a string variable to put in another variable for printing.";
$string2 = 100charfunction($string1);
print $string2
To get:
要得到：
I am looking for a way to pull the first 100 characters from a string vari
回答by Patrick Desjardins
$small = substr($big, 0, 100);
For String Manipulationhere is a page with a lot of function that might help you in your future work.
对于字符串操作，这里有一个包含很多功能的页面，可能会对您未来的工作有所帮助。
回答by Stein G. Strindhaug
You could use substr, I guess:
你可以使用 substr，我猜：
$string2 = substr($string1, 0, 100);
or mb_substr for multi-byte strings:
或 mb_substr 用于多字节字符串：
$string2 = mb_substr($string1, 0, 100);
You could create a function wich uses this function and appends for instance '...'to indicate that it was shortened. (I guess there's allready a hundred similar replies when this is posted...)
您可以创建一个使用此函数的函数并附加例如'...'以指示它已被缩短。（我猜这个贴出来的时候已经有一百个类似的回复了……）
回答by markus
$x = '1234567'; echo substr ($x, 0, 3); // outputs 123 echo substr ($x, 1, 1); // outputs 2 echo substr ($x, -2); // outputs 67 echo substr ($x, 1); // outputs 234567 echo substr ($x, -2, 1); // outputs 6
回答by Coz
A late but useful answer, PHP has a function specifically for this purpose.
一个迟到但有用的答案，PHP 有一个专门用于此目的的函数。
$string = mb_strimwidth($string, 0, 100);
$string = mb_strimwidth($string, 0, 97, '...'); //optional characters for end
回答by Kostis
try this function
试试这个功能
function summary($str, $limit=100, $strip = false) {
$str = ($strip == true)?strip_tags($str):$str;
if (strlen ($str) > $limit) {
$str = substr ($str, 0, $limit - 3);
return (substr ($str, 0, strrpos ($str, ' ')).'...');
}
return trim($str);
}
回答by joan16v
Without php internal functions:
没有php内部函数：
function charFunction($myStr, $limit=100) {
$result = "";
for ($i=0; $i<$limit; $i++) {
$result .= $myStr[$i];
}
return $result;
}
$string1 = "I am looking for a way to pull the first 100 characters from a string variable to put in another variable for printing.";
echo charFunction($string1);
