如何在PHP中使用CBC加密模式

I'm trying to encrypt a string, 50-150 characters long, with AES in a mode other than ECB (due to security issues). I wrote an encryption class and am able to encrypt/decrypt perfectly in ECB mode, however when I switch to CBC, CTR or OFB mode, I fail to get the original plaintext back.I'm trying to encrypt a string, 50-150 characte