bindParam 和 bindValue 有什么区别? [英] What is the difference between bindParam and bindValue?

问题描述

PDOStatement::bindParam() 和有什么区别代码> 和 PDOStatement::bindValue()?

What is the difference between PDOStatement::bindParam() and PDOStatement::bindValue()?

推荐答案

答案在 bindParam:

与 PDOStatement::bindValue() 不同，该变量被绑定为一个引用，并且只会在 PDOStatement::execute() 被调用时被评估.

Unlike PDOStatement::bindValue(), the variable is bound as a reference and will only be evaluated at the time that PDOStatement::execute() is called.

和execute

调用 PDOStatement::bindParam() 将 PHP 变量绑定到参数标记:绑定变量将其值作为输入传递并接收其关联参数标记的输出值(如果有)

call PDOStatement::bindParam() to bind PHP variables to the parameter markers: bound variables pass their value as input and receive the output value, if any, of their associated parameter markers

示例:

$value = 'foo';
$s = $dbh->prepare('SELECT name FROM bar WHERE baz = :baz');
$s->bindParam(':baz', $value); // use bindParam to bind the variable
$value = 'foobarbaz';
$s->execute(); // executed with WHERE baz = 'foobarbaz'

或

$value = 'foo';
$s = $dbh->prepare('SELECT name FROM bar WHERE baz = :baz');
$s->bindValue(':baz', $value); // use bindValue to bind the variable's value
$value = 'foobarbaz';
$s->execute(); // executed with WHERE baz = 'foo'

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