King James圣经(传说中的KJV,即King James Version,是17世纪英王詹姆斯一世的许可下的圣经钦定译本)的txt文件,大小约为5.5Mb,在大文本中进行单词查找,一次性读取再进行查找,会占用较大的内存,分行/分块 读取,再进行查找,可以减少内存的使用

<?php 
//起始内存占用 
$memBegin = memory_get_usage(); 
//关键词 
$keyword = $argv[1]?$argv[1]:'God'; 
//是否大小写敏感 
$caseSenstive = $argv[2]==1?true:false; 
//单词匹配正则 
$regx = $caseSenstive?"/{$keyword}/":"/{$keyword}/i"; 
//行查找函数 
$lineFindFunc = $caseSenstive?"strpos":"stripos"; 

//https://www.ccel.org/ccel/bible/kjv.txt 
$filename = 'kjv.txt'; 
$fp = fopen($filename,'rb'); 
$ret = array(); 

$lineCount = 1; 
$demoLine = 285; 
//如果文件未读完,则一直继续 
while(!feof($fp)){ 
    //读取一行 
    $buffer = fgets($fp); 
    //匹配单词并计数 
    if(preg_match_all($regx,$buffer,$matches)){ 
        $num = count($matches[0]); 
        //在该行查找单词 
        $ret[$lineCount] = implode(',',findInLine($buffer,$keyword,$num)); 
        if($lineCount==$demoLine){
            $demoContent = trim($buffer);
        } 
     }
     $lineCount++;
}

//结束时的内存占用
$memEnd = memory_get_usage();

//输出结果
$out = "keyword is {$keyword},case :".intval($caseSenstive)."\n";
$out.= "demoLine:{$demoLine}\n";
$out.= "demoContent:{$demoContent}\n";
$out.= "search result:".$ret[285]."\n";
$out.= "memory usage:".($memEnd-$memBegin)/(1024*1024)."Mb\n";

echo $out;

/**
* 行内查找函数
* @param $line string 行文本
* @param $keyword string 关键词
* @param $num int 关键词出现的次数
* @return string 关键词出现的位置 1,4,5
*/
function findInLine($line,$keyword,$num){
	global $lineFindFunc;
	$i = 0;
	$offset = 0;
	$ret = array();
	$line = trim($line);
	while($i<$num){
		$pos = $lineFindFunc($line,$keyword,$offset);
		if($pos!==false){
			$ret[] = $pos;
			$offset = ($pos+1);
			$i++;
		}
	}
	return $ret;
}

运行:php searchword.php god 0
运行结果:
keyword is god,case :0
demoLine:285
demoContent:without the word of God? What word of God (whereof we may be sure)
search result:20,38
memory usage:1.223258972168Mb

 

附:最好的圣经app YouVersion下载

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