php preg_split()字符串分割函数的使用方法
array preg_split(string pattern,string subject[,int limit[,int flags]])
返回一个数组,包含 subject 中沿着与 pattern 正则表达式来匹配的边界所分割的子串.
如果指定了 limit,则最多返回 limit 个子串,如果 limit 是 -1,则意味着没有限制,可以用来继续指定可选参数 flags.
flags 可以是下列标记的任意组合(用按位或运算符 | 组合):
PREG_SPLIT_NO_EMPTY
如果设定了本标记,则 preg_split() 只返回非空的成分,看个实例:
<?php $word_count = $word_length = 0; if ( $fh = fopen ( 'novel.txt' , 'r' )) { while (! feof ( $fh )) { if ( $s = fgets ( $fh )) { $words = preg_split( '/s+/' , $s ,-1,PREG_SPLIT_NO_EMPTY); foreach ( $words as $word ) { $word_count ++; $word_length += strlen ( $word ); } } } } print sprintf( "The average word length over %d words is %.02f characters." , $word_count , $word_length / $word_count ); ?>PHP简单应用:
<? $user_info = "+J+++G+++++w" ; $fields = preg_split( "/+{1,}/" , $user_info ); while ( $x < sizeof( $fields )) : print $fields [ $x ]. "<br>" ; $x ++; endwhile ; ?>由于分割后变成了数组,所以我们要利用foreach 来遍历输出了:
<?php $delimitedText = "+A+++G+++++++++++C" ; $fields = preg_split( "/+{1,}/" , $delimitedText ); foreach ( $fields as $field ) echo $field . "<br />" ; ?> <? $text = "a, o, p" ; $fruitarray = preg_split( "/, | and /" , $text ); print "<pre>n" ; print_r( $fruitarray ); print "</pre>n" ; ?>查看更多关于php preg_split()字符串分割函数的使用方法 - php函数的详细内容...
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