求帮助，怎么把 $projectcode_array = ["20130719","20130718","20130717"]; 变成$projectcode_array = ['20130719','20130718','20130717'];

怎么把数组中双引号 变成单引号

$projectcode_array = ["20130719","20130718","20130717"]; 
变成$projectcode_array = ['20130719','20130718','20130717'];

复制到notepad，ctrl+h替换，把“替换成’