[英]Cut-off a string after the fourth line-break
我有問題,我想在第四個換行符后截斷一個長字符串,並讓它繼續“ ...”
<?php
$teststring = "asddsadsadsadsaa\n
asddsadsadsadsaa\n
asddsadsadsadsaa\n
asddsadsadsadsaa\n
asddsadsadsadsaa\n
asddsadsadsadsaa\n";
?>
應該變成:
<?php
$teststring = "asddsadsadsadsaa\n
asddsadsadsadsaa\n
asddsadsadsadsaa\n
asddsadsadsadsaa...";
?>
我知道在第一個\\n
之后如何斷開字符串,但在第四個之后我不知道如何執行。
我希望你能幫助我。
您可以將琴弦炸開,然后取出所需的所有零件
$newStr = ""; // initialise the string
$arr = explode("\n", $teststring);
if(count($arr) > 4) { // you've got more than 4 line breaks
$arr = array_splice($arr, 0, 4); // reduce the lines to four
foreach($arr as $line) { $newStr .= $line; } // store them all in a string
$newStr .= "...";
} else {
$newStr = $teststring; // there was less or equal to four rows so to us it'all ok
}
echo preg_replace ('~((.*?\x0A){4}).*~s', '\\1...', $teststring);
像這樣嗎?
$teststring = "asddsadsadsadsaa
asddsadsadsadsaa
asddsadsadsadsaa
asddsadsadsadsaa
asddsadsadsadsaa
asddsadsadsadsaa";
$e = explode("\n", $teststring);
if (count($e) > 4)
{
$finalstring = "";
for ($i = 0; $i < 4; $i++)
{
$finalstring.= $e[$i];
}
}
else
{
$finalstring = $teststring;
}
echo "<pre>$finalstring</pre>";
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