php 不破坏单词截取字符串的简单示例

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经测试代码如下：

<?php
/**
 * 截取字符串
 *
 * @param 
 * @arrange (512.笔记) www.q1010.com
 * snippet(phrase,[max length],[phrase tail])
 * snippetgreedy(phrase,[max length before next space],[phrase tail])
 **/
function snippet($text,$length=64,$tail="...") {
$text = trim($text);
$txtl = strlen($text);
if($txtl > $length) {
for($i=1;$text[$length-$i]!=" ";$i++) {
if($i == $length) {
return substr($text,0,$length) . $tail;
}
}
$text = substr($text,0,$length-$i+1) . $tail;
}
return $text;
}

// It behaves greedy, gets length characters ore goes for more

function snippetgreedy($text,$length=64,$tail="...") {
$text = trim($text);
if(strlen($text) > $length) {
for($i=0;$text[$length+$i]!=" ";$i++) {
if(!$text[$length+$i]) {
return $text;
}
}
$text = substr($text,0,$length+$i) . $tail;
}
return $text;
}

// The same as the snippet but removing latest low punctuation chars,
// if they exist (dots and commas). It performs a later suffixal trim of spaces

function snippetwop($text,$length=64,$tail="...") {
$text = trim($text);
$txtl = strlen($text);
if($txtl > $length) {
for($i=1;$text[$length-$i]!=" ";$i++) {
if($i == $length) {
return substr($text,0,$length) . $tail;
}
}
for(;$text[$length-$i]=="," || $text[$length-$i]=="." || $text[$length-$i]==" ";$i++) {;}
$text = substr($text,0,$length-$i+1) . $tail;
}
return $text;
}

/*
echo(snippet("this is not too long to run on the column on the left, perhaps, or perhaps yes, no idea") . "<br>");
echo(snippetwop("this is not too long to run on the column on the left, perhaps, or perhaps yes, no idea") . "<br>");
echo(snippetgreedy("this is not too long to run on the column on the left, perhaps, or perhaps yes, no idea"));
*/


/*** 来自：四海网（www.q1010.com） ***/ 
?>

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关键词：截取字符串